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How do you solve x^(2) -8x=65 is it (x-4)^2-81
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x^(2) -8x=65

is it
(x-4)^2-81

User Stav Shamir
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1 Answer

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x² - 8x = 65
x² - 8x + 16 = 65
x² - 8x + 16 - 65 = 65 - 65
x² - 4x - 4x + 16 - 65 = 0
x(x) - x(4) - 4(x) + 4(4) - 65 = 0
x(x - 4) - 4(x - 4) - 65 = 0
(x - 4)(x - 4) - 65 = 0
(x - 4)² - 65 = 0

It is actually (x - 4)² - 65.
User Doug Mead
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