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20-02-2017
Mathematics

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Solve this equation using an algebraic method: (x + 4)( x - 4) = 9.

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20-02-2017

Sure!

(x+4)(x-4)=9
x^2 +4x-4x - 16 =9
x^2 -16 = 9
x^2 =25
x = -5
x = 5

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