2x^2+10x-36=720

Solution for 2x^2+10x-36=720 equation:

2x^2+10x-36=720

We move all terms to the left:

2x^2+10x-36-(720)=0

We add all the numbers together, and all the variables

2x^2+10x-756=0

a = 2; b = 10; c = -756;
Δ = b2-4ac
Δ = 102-4·2·(-756)
Δ = 6148
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:

$\sqrt{\Delta}=\sqrt{6148}=\sqrt{4*1537}=\sqrt{4}*\sqrt{1537}=2\sqrt{1537}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-2\sqrt{1537}}{2*2}=\frac{-10-2\sqrt{1537}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+2\sqrt{1537}}{2*2}=\frac{-10+2\sqrt{1537}}{4}
$