-x^2+16x+49=0

Solution for -x^2+16x+49=0 equation:

-x^2+16x+49=0

We add all the numbers together, and all the variables

-1x^2+16x+49=0

a = -1; b = 16; c = +49;
Δ = b2-4ac
Δ = 162-4·(-1)·49
Δ = 452
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:

$\sqrt{\Delta}=\sqrt{452}=\sqrt{4*113}=\sqrt{4}*\sqrt{113}=2\sqrt{113}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(16)-2\sqrt{113}}{2*-1}=\frac{-16-2\sqrt{113}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(16)+2\sqrt{113}}{2*-1}=\frac{-16+2\sqrt{113}}{-2}
$