7y^2=49

Solution for 7y^2=49 equation:

7y^2=49

We move all terms to the left:

7y^2-(49)=0

a = 7; b = 0; c = -49;
Δ = b2-4ac
Δ = 02-4·7·(-49)
Δ = 1372
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{1372}=\sqrt{196*7}=\sqrt{196}*\sqrt{7}=14\sqrt{7}$
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-14\sqrt{7}}{2*7}=\frac{0-14\sqrt{7}}{14}
=-\frac{14\sqrt{7}}{14}
=-\sqrt{7}
$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+14\sqrt{7}}{2*7}=\frac{0+14\sqrt{7}}{14}
=\frac{14\sqrt{7}}{14}
=\sqrt{7}
$