X2-8x+21 make the expression (x-h)2+k is equivalent
1 answer:
X2-8x+21 = x² - 8x + (8/2)²- <span><span>(8/2)²</span> + 21
</span>
<span>= (x² - 8x + 16 ) - 16 + 21
= (x - 4)²+ 5
</span>
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