k^2+10k+16=9

Solution for k^2+10k+16=9 equation:

k^2+10k+16=9

We move all terms to the left:

k^2+10k+16-(9)=0

We add all the numbers together, and all the variables

k^2+10k+7=0

a = 1; b = 10; c = +7;
Δ = b2-4ac
Δ = 102-4·1·7
Δ = 72
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$k_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$k_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{72}=\sqrt{36*2}=\sqrt{36}*\sqrt{2}=6\sqrt{2}$
$k_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-6\sqrt{2}}{2*1}=\frac{-10-6\sqrt{2}}{2}
$
$k_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+6\sqrt{2}}{2*1}=\frac{-10+6\sqrt{2}}{2}
$