Exponents & Indices
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Questions and Answers

Which of the following expressions is equivalent to $(4ab)^3$?

  • $12a^3b^3$
  • $64a^3b^3$ (correct)
  • $4a^3b^3$
  • $64ab^3$

The prime factorization of a number is $2^3 \times 3^2 \times 5$. What is the number?

  • 720
  • 180
  • 360 (correct)
  • 60

Simplify the expression: $\frac{5^7 \times 5^{-3}}{5^2}$

  • $5^{12}$
  • $5^3$
  • $5^{-2}$
  • $5^2$ (correct)

Which expression is equivalent to $(-a)^5$, assuming a is a positive integer?

<p>$-a^5$ (C)</p> Signup and view all the answers

If $x = 2$ and $y = 3$, what is the value of $2x^2y^3$?

<p>216 (D)</p> Signup and view all the answers

Express $0.000064$ in scientific notation.

<p>$6.4 imes 10^{-5}$ (B)</p> Signup and view all the answers

What is the value of x in the equation $3^{x+2} = 27$?

<p>1 (C)</p> Signup and view all the answers

Which of the following is equivalent to the expression $\sqrt{16x^4y^6}$?

<p>$4x^2y^3$ (C)</p> Signup and view all the answers

Given that $x^a = 5$ and $x^b = 3$, what is the value of $x^{a+b}$?

<p>15 (A)</p> Signup and view all the answers

Determine the prime factorization of 360.

<p>$2^3 imes 3^2 imes 5$ (A)</p> Signup and view all the answers

Given the expression $5 imes a imes a imes a imes 7$, which of the following correctly represents this expression in index form?

<p>$35a^3$ (D)</p> Signup and view all the answers

Express the prime factorisation of 216 in index form.

<p>$2 imes 3^3$ (D)</p> Signup and view all the answers

If $(ab)^2 = (3 imes 2)^2$, what is the value of $(ab)^2$?

<p>36 (C)</p> Signup and view all the answers

Simplify the expression $\frac{4d imes 2e}{4}$.

<p>$2de$ (C)</p> Signup and view all the answers

Rewrite $3xx imes 3xx imes 3xx imes xx$ using index notation.

<p>$3^3x^8$ (B)</p> Signup and view all the answers

If a quantity decreases by 10% each time period, which expression calculates the number of periods, $x$, needed for an initial quantity of 12 to be less than or equal to 6.4?

<p>$12 imes 0.9^x \le 6.4$ (B)</p> Signup and view all the answers

Which of the following represents the expanded form of $(Sw)^4$?

<p>$S imes w imes S imes w imes S imes w imes S imes w$ (C)</p> Signup and view all the answers

Which expression is equivalent to $3pq imes 3pq imes 3pq$?

<p>$(3pq)^3$ (C)</p> Signup and view all the answers

If $x$ is a negative number, which of the following expressions will always result in a positive number?

<p>$(-x)^4$ (A)</p> Signup and view all the answers

The number of bacteria in a petri dish triples every hour. If there were originally 1000 bacteria, which expression represents the number of bacteria after 5 hours?

<p>$1000 imes 3^5$ (B)</p> Signup and view all the answers

Flashcards

Index Notation

A way to represent repeated multiplication using a base and an exponent.

Prime Factorisation

Writing a number as a product of its prime numbers.

Base (in Index Notation)

The number that is multiplied by itself in index notation.

Exponent (or Index)

The number of times the base is multiplied by itself.

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Prime Number

A number that is only divisible by 1 and itself.

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Expanded Form (Index Notation)

Rewriting index notation in expanded form.

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Factor Tree

A diagram used to find the prime factors of a number.

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(-x)^odd = -x

A negative number raised to an odd power results in an odd number.

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(-x)^even = x

A negative number raised to an even power becomes positive.

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Index Form

Represents a term using a base and a power.

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Index/Exponent

The number of times a number is multiplied by itself.

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Expanded Form

A number written as a product of its factors.

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Power of a product

An expression enclosed in parentheses raised to a power.

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Negative numbers with exponents

A way to evaluate expressions with negative numbers

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Variable with an exponent.

Repeated multiplication of a variable.

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