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Rate me on the question-Solve this equation using an algebraic method: (x + 4)( x - 4) = 9

 Oct 12, 2016
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Solve for x:
(x-4) (x+4) = 9

Expand out terms of the left hand side:
x^2-16 = 9

Add 16 to both sides:
x^2 = 25

Take the square root of both sides:
Answer: |x = 5      or       x = -5

 Oct 12, 2016

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