9
Please tell me you're in 4th grade.
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x2-2x-10-5 = 0 x2-2x-15 = 0 (x+3)(x-5) = 0 x = -3 or x = 5
I think you've typed too many equalses, shouldn't there be a plus or a minus somewhere?
x = 15
2x to the fourth power minus 162 equals -146
2x2 + 2x - 8 = 2(x2 + x - 4). This can take any value greater than or equal to -8.5