x(x+5)=7x+35

Solution for x(x+5)=7x+35 equation:

x(x+5)=7x+35

We move all terms to the left:

x(x+5)-(7x+35)=0

We multiply parentheses

x^2+5x-(7x+35)=0

We get rid of parentheses

x^2+5x-7x-35=0

We add all the numbers together, and all the variables

x^2-2x-35=0

a = 1; b = -2; c = -35;
Δ = b2-4ac
Δ = -22-4·1·(-35)
Δ = 144
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{144}=12$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-2)-12}{2*1}=\frac{-10}{2}
=-5
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+12}{2*1}=\frac{14}{2}
=7
$