25-04-2018
Mathematics

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x2-8x+21 make the expression (x-h)2+k is equivalent

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25-04-2018

x2-8x+21 = x² - 8x + (8/2)²- (8/2)² + 21

= (x² - 8x + 16 ) - 16 + 21
= (x - 4)²+ 5

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