-5x+4=-x2+16

Solution for -5x+4=-x2+16 equation:

-5x+4=-x2+16

We move all terms to the left:

-5x+4-(-x2+16)=0

We add all the numbers together, and all the variables

-(-1x^2+16)-5x+4=0

We get rid of parentheses

1x^2-5x-16+4=0

We add all the numbers together, and all the variables

x^2-5x-12=0

a = 1; b = -5; c = -12;
Δ = b2-4ac
Δ = -52-4·1·(-12)
Δ = 73
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-5)-\sqrt{73}}{2*1}=\frac{5-\sqrt{73}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{73}}{2*1}=\frac{5+\sqrt{73}}{2}
$