x*(x+8)=148

Solution for x*(x+8)=148 equation:

x(x+8)=148

We move all terms to the left:

x(x+8)-(148)=0

We multiply parentheses

x^2+8x-148=0

a = 1; b = 8; c = -148;
Δ = b2-4ac
Δ = 82-4·1·(-148)
Δ = 656
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:

$\sqrt{\Delta}=\sqrt{656}=\sqrt{16*41}=\sqrt{16}*\sqrt{41}=4\sqrt{41}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(8)-4\sqrt{41}}{2*1}=\frac{-8-4\sqrt{41}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(8)+4\sqrt{41}}{2*1}=\frac{-8+4\sqrt{41}}{2}
$