13x2-17=11

Solution for 13x2-17=11 equation:

13x^2-17=11

We move all terms to the left:

13x^2-17-(11)=0

We add all the numbers together, and all the variables

13x^2-28=0

a = 13; b = 0; c = -28;
Δ = b2-4ac
Δ = 02-4·13·(-28)
Δ = 1456
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:

$\sqrt{\Delta}=\sqrt{1456}=\sqrt{16*91}=\sqrt{16}*\sqrt{91}=4\sqrt{91}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-4\sqrt{91}}{2*13}=\frac{0-4\sqrt{91}}{26}
=-\frac{4\sqrt{91}}{26}
=-\frac{2\sqrt{91}}{13}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+4\sqrt{91}}{2*13}=\frac{0+4\sqrt{91}}{26}
=\frac{4\sqrt{91}}{26}
=\frac{2\sqrt{91}}{13}
$