Question

x ²+8x-16 =0 is a quadratic equation
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Answer 1

Step-by-step explanation:

yes, it is quadratic equation

And formula of quadratic equation is ax²+bx+c=0

Answer 2

Step-by-step explanation:

$x {}^{2} + 8x - 16 = 0$

$(x - 4) {}^{2}$

comparing (x-4) with zero(0)

x-4=0

x=4