Question

Solve -15=x2-8x

Answer 1

I'm assuming you meant:

$$-15 = x^{2} - 8x$$

And to solve for x.

1) Move everything to one side, set the equation to zero
$$ 0 = x^{2} - 8x + 15 $$

2) Use the quadratic formula to obtain the roots of the function
(x-5)(x-3)

So x is +5 and +3

Answer 2

Thanks