2x^2-16x=-7

Solution for 2x^2-16x=-7 equation:

2x^2-16x=-7

We move all terms to the left:

2x^2-16x-(-7)=0

We add all the numbers together, and all the variables

2x^2-16x+7=0

a = 2; b = -16; c = +7;
Δ = b2-4ac
Δ = -162-4·2·7
Δ = 200
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{200}=\sqrt{100*2}=\sqrt{100}*\sqrt{2}=10\sqrt{2}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-16)-10\sqrt{2}}{2*2}=\frac{16-10\sqrt{2}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-16)+10\sqrt{2}}{2*2}=\frac{16+10\sqrt{2}}{4}
$