x*x-8x+14=2x-7

Solution for x*x-8x+14=2x-7 equation:

x*x-8x+14=2x-7

We move all terms to the left:

x*x-8x+14-(2x-7)=0

We add all the numbers together, and all the variables

-8x+x*x-(2x-7)+14=0

Wy multiply elements

x^2-8x-(2x-7)+14=0

We get rid of parentheses

x^2-8x-2x+7+14=0

We add all the numbers together, and all the variables

x^2-10x+21=0

a = 1; b = -10; c = +21;
Δ = b2-4ac
Δ = -102-4·1·21
Δ = 16
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{16}=4$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10)-4}{2*1}=\frac{6}{2}
=3
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10)+4}{2*1}=\frac{14}{2}
=7
$