SAT Nonlinear equations in one variable and systems of equations in two variables Practice Question 2 (Easy)

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Question bank / Nonlinear equations in one variable and systems of equations in two variables

Math · Advanced MathEasy

What are the solutions to the equation $(x - 4)(x + 9) = 0$ ?

$-4$ and $9$

$4$ and $-9$

$4$ and $9$

$-4$ and $-9$

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Answer: B

A product equals zero when one of its factors equals zero. If $x - 4 = 0$ , then $x = 4$ . If $x + 9 = 0$ , then $x = -9$ .

Choice A reverses the signs, taking the numbers from the factors as they appear.

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