Question

What does g equal if the equation is 76=g2nd power

Answer 1

$\sf76=g^2$

Find the square root of both sides:

$\sf~g=\sqrt{76}$

$\sf~g\approx8.72$

Answer 2

If 76 is 'g to the second power', then 'g' is the square root of 76.

Every positive number has two square roots.

The square roots of 76 are irrational numbers ... they can't be written exactly
with just digits.   When they're rounded to a reasonable number of decimal
places, they are ...

        g = + 8.7178
and
        g = - 8.7178 .