Algebra Class: Solving Quadratics by Factorisation
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Questions and Answers

What is the first step to solve the equation $3x^2 = 27$?

  • Factor the equation directly
  • Set both sides to equal zero
  • Divide both sides by 3
  • Write the equation in standard form (correct)
  • After rearranging the equation $3x^2 - 27 = 0$, what is the next logical step?

  • Factoring the left side of the equation (correct)
  • Adding 27 to both sides
  • Dividing the entire equation by 3
  • Calculating the roots directly
  • Which of the following represents the equation in its factored form after solving $3x^2 - 27 = 0$?

  • $3(x - 3)(x + 3) = 0$ (correct)
  • $(3x^2 + 9)(x - 3) = 0$
  • $(x - 3)(x + 3) = 0$
  • $(3x - 9)(x + 3) = 0$
  • What is the value of $x$ when solving the equation $3x^2 - 27 = 0$?

    <p>±3</p> Signup and view all the answers

    Why is it necessary to write the equation in the standard form $3x^2 - 27 = 0$ before solving?

    <p>To factor the equation correctly</p> Signup and view all the answers

    Study Notes

    Solving Quadratic Equations by Factorisation

    • Assumes prior knowledge of factorisation methods for quadratic expressions.
    • Factorisation is a crucial skill for simplifying and solving quadratic equations.

    Example Problem

    • To solve the equation 3x² = 27, start by rearranging it into standard quadratic form.
    • Standard form of a quadratic equation is represented as ax² + bx + c = 0.
    • Subtract 27 from both sides of the equation, resulting in 3x² - 27 = 0.
    • The next steps typically involve factorising the expression formed, if possible, to find the values of x.

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    Description

    This quiz focuses on solving quadratic equations using the factorisation method. It is designed for students who have a prior understanding of how to factorise quadratic expressions. Challenge your skills with various problems to reinforce your knowledge in this essential algebra topic.

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