Algebra Equations and Functions

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Questions and Answers

What is the value of x in the equation 2x + 5 = 11?

  • 3 (correct)
  • 4
  • 5
  • 2

What is the composition of functions f(x) = 2x and g(x) = x^2?

  • g(f(x)) = 2x^2
  • g(f(x)) = 4x^2
  • f(g(x)) = 2x^2
  • f(g(x)) = 4x^2 (correct)

What is the equation of a line that passes through the points (2,3) and (4,5)?

  • y = x + 1
  • y = 2x - 1
  • y = 2x + 1 (correct)
  • y = x - 1

What is the value of sin(2x) in terms of sin(x) and cos(x)?

<p>2sin(x)cos(x) (B)</p> Signup and view all the answers

What is the derivative of the function f(x) = 3x^2 + 2x - 5?

<p>f'(x) = 6x + 2 (D)</p> Signup and view all the answers

What is the value of the limit as x approaches 2 of the function f(x) = (x^2 - 4) / (x - 2)?

<p>4 (D)</p> Signup and view all the answers

What is the equation of a circle with center (3, -2) and radius 4?

<p>(x - 3)^2 + (y + 2)^2 = 16 (D)</p> Signup and view all the answers

What is the graph of the function f(x) = |x|?

<p>A V-shaped graph with a minimum at x = 0 (D)</p> Signup and view all the answers

What is the value of cos(2x) in terms of cos(x)?

<p>2cos^2(x) - 1 (D)</p> Signup and view all the answers

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Study Notes

Algebra

  • Equations and Inequalities
    • Linear equations: ax + by = c, where a, b, and c are constants
    • Quadratic equations: ax^2 + bx + c = 0, where a, b, and c are constants
    • Solving linear and quadratic equations using various methods (e.g. substitution, elimination, quadratic formula)
    • Graphing linear and quadratic equations on the coordinate plane
  • Functions
    • Domain and range of a function
    • Composition of functions
    • Inverse functions
    • Graphing functions, including identifying maxima and minima

Geometry

  • Points, Lines, and Planes
    • Midpoint and distance formulas
    • Slope of a line
    • Equation of a line (point-slope and slope-intercept forms)
    • Parallel and perpendicular lines
  • Triangles and Quadrilaterals
    • Properties of congruent and similar triangles
    • Types of triangles (e.g. isosceles, right, equilateral)
    • Properties of quadrilaterals (e.g. rectangles, squares, trapezoids)

Trigonometry

  • Angles and Triangles
    • Degree and radian measures of angles
    • Trigonometric ratios (sine, cosine, tangent)
    • Solving right triangles using trigonometric ratios
    • Graphing trigonometric functions
  • Identities and Formulas
    • Pythagorean identity
    • Sum and difference formulas
    • Double and half-angle formulas

Calculus (Introduction)

  • Limits and Continuity
    • Basic limit properties and rules
    • Continuity of functions
    • Intermediate Value Theorem
  • Derivatives
    • Basic derivative rules (e.g. power rule, product rule)
    • Geometric interpretation of derivatives (e.g. tangent lines, slopes)

Algebra

  • Equations and Inequalities
    • Linear equations have the form ax + by = c, where a, b, and c are constants
    • Quadratic equations have the form ax^2 + bx + c = 0, where a, b, and c are constants
    • Methods for solving linear and quadratic equations include substitution, elimination, and the quadratic formula
    • Graphing linear and quadratic equations involves plotting points on the coordinate plane
  • Functions
    • The domain of a function is the set of input values, while the range is the set of output values
    • Composition of functions involves combining functions by applying one function to the output of another
    • Inverse functions "undo" each other, and can be used to solve equations
    • Graphing functions helps identify maxima and minima

Geometry

  • Points, Lines, and Planes
    • The midpoint formula calculates the midpoint of a line segment: M = ((x1+x2)/2, (y1+y2)/2)
    • The distance formula calculates the distance between two points: √((x2-x1)^2 + (y2-y1)^2)
    • The slope of a line is a measure of its steepness, calculated as m = (y2-y1)/(x2-x1)
    • The equation of a line can be written in point-slope or slope-intercept form
    • Parallel lines have the same slope, while perpendicular lines have slopes that are negative reciprocals
  • Triangles and Quadrilaterals
    • Congruent triangles have equal corresponding sides and angles, while similar triangles have proportional corresponding sides
    • There are different types of triangles, including isosceles, right, and equilateral
    • Quadrilaterals can be classified as rectangles, squares, trapezoids, and more, each with unique properties

Trigonometry

  • Angles and Triangles
    • Angles can be measured in degrees or radians
    • Trigonometric ratios include sine, cosine, and tangent, which are used to solve right triangles
    • Graphing trigonometric functions involves plotting periodic curves
  • Identities and Formulas
    • The Pythagorean identity states sin^2(θ) + cos^2(θ) = 1
    • The sum and difference formulas are used to find trigonometric ratios for sums and differences of angles
    • The double and half-angle formulas are used to find trigonometric ratios for double and half angles

Calculus (Introduction)

  • Limits and Continuity
    • The basic limit properties include the sum and product rules, and the squeeze theorem
    • Continuity of functions is important for many calculus concepts
    • The Intermediate Value Theorem states that a continuous function on a closed interval takes on every value between its maximum and minimum
  • Derivatives
    • The power rule is a basic derivative rule, stating that if f(x) = x^n, then f'(x) = nx^(n-1)
    • The product rule states that if f(x) = g(x) * h(x), then f'(x) = g'(x) * h(x) + g(x) * h'(x)
    • Geometrically, derivatives represent the slope of a tangent line to a curve

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