Solve x^2 - 9 = 0.

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Study for the 8th Grade FAST Mathematics Pre-Algebra Test. Enhance your skills with interactive flashcards and multiple choice questions, each containing hints and explanations to boost your comprehension and readiness for the exam. Get ready to ace your test!

Multiple Choice

Solve x^2 - 9 = 0.

Explanation:
This tests solving a quadratic by recognizing a difference of squares. 9 is 3^2, so x^2 - 9 factors as (x - 3)(x + 3). Setting this equal to zero and using the zero-product property means either x - 3 = 0 or x + 3 = 0, giving x = 3 or x = -3. Those values satisfy the original equation because 3^2 - 9 = 0 and (-3)^2 - 9 = 0. If you try other values: x = 9 or -9 makes x^2 - 9 = 72, not 0; x = 0 gives -9; x = 1 or -1 gives -8.

This tests solving a quadratic by recognizing a difference of squares. 9 is 3^2, so x^2 - 9 factors as (x - 3)(x + 3). Setting this equal to zero and using the zero-product property means either x - 3 = 0 or x + 3 = 0, giving x = 3 or x = -3. Those values satisfy the original equation because 3^2 - 9 = 0 and (-3)^2 - 9 = 0.

If you try other values: x = 9 or -9 makes x^2 - 9 = 72, not 0; x = 0 gives -9; x = 1 or -1 gives -8.

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