Question

find the zeros of polynomial x square - 2 x minus 12

Answer 1

x²-2x-12 = 0
d = b²-4ac
d = (-2)²-4(-12)
d = 4+44 = 48
x = (-b ± √d)/2a
x = (2 ± √48)/2 = (2 ± 4√2)/2
x = 1 ±2√2
By quadratic formula

Answer 2

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Here is your answer