x * x - 9 = 0
PEMDAS = Multiplication first.
What multiplied it self equals nine? 3. So x = 3
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Solve this problem -x squared -40x- 80 =0
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3x2 when x = 2 is the answer 3 X 4 = 12 or is the answer (3 X 2)2 = 62 = 36
The discriminant b2-4ac is -23
0x-x=0