9x^2-7x=11x^2-10x-5

Solution for 9x^2-7x=11x^2-10x-5 equation:

9x^2-7x=11x^2-10x-5

We move all terms to the left:

9x^2-7x-(11x^2-10x-5)=0

We get rid of parentheses

9x^2-11x^2-7x+10x+5=0

We add all the numbers together, and all the variables

-2x^2+3x+5=0

a = -2; b = 3; c = +5;
Δ = b2-4ac
Δ = 32-4·(-2)·5
Δ = 49
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{49}=7$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-7}{2*-2}=\frac{-10}{-4}
=2+1/2
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+7}{2*-2}=\frac{4}{-4}
=-1
$