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Simplifying
4d2 + -12 = 9
Reorder the terms:
-12 + 4d2 = 9
Solving
-12 + 4d2 = 9
Solving for variable 'd'.
Move all terms containing d to the left, all other terms to the right.
Add '12' to each side of the equation.
-12 + 12 + 4d2 = 9 + 12
Combine like terms: -12 + 12 = 0
0 + 4d2 = 9 + 12
4d2 = 9 + 12
Combine like terms: 9 + 12 = 21
4d2 = 21
Divide each side by '4'.
d2 = 5.25
Simplifying
d2 = 5.25
Take the square root of each side:
d = {-2.291287847, 2.291287847}
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