3 years ago

What is x^2+8x-5 in vertex form? Please explain.

Mathematics

2 answers:

faust18 [17]3 years ago

5 0

$x^2+8x-5=\\
x^2+2\cdot4\cdot x-5=\\
x^2+2\cdot4\cdot x+4^2-4^2-5=\\
(x+4)^2-16-5=\\
(x+4)^2-21
$

lina2011 [118]3 years ago

5 0

$x^2+8x-5=\\ x^2-8x+16-21=\\ (x-4)^2-21$

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