7(d^2-4)=0

Solution for 7(d^2-4)=0 equation:

Simplifying
7(d2 + -4) = 0

Reorder the terms:
7(-4 + d2) = 0
(-4 * 7 + d2 * 7) = 0
(-28 + 7d2) = 0

Solving
-28 + 7d2 = 0

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add '28' to each side of the equation.
-28 + 28 + 7d2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + 7d2 = 0 + 28
7d2 = 0 + 28

Combine like terms: 0 + 28 = 28
7d2 = 28

Divide each side by '7'.
d2 = 4

Simplifying
d2 = 4

Take the square root of each side:
d = {-2, 2}