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Simplifying
2d2 + 5 = 55
Reorder the terms:
5 + 2d2 = 55
Solving
5 + 2d2 = 55
Solving for variable 'd'.
Move all terms containing d to the left, all other terms to the right.
Add '-5' to each side of the equation.
5 + -5 + 2d2 = 55 + -5
Combine like terms: 5 + -5 = 0
0 + 2d2 = 55 + -5
2d2 = 55 + -5
Combine like terms: 55 + -5 = 50
2d2 = 50
Divide each side by '2'.
d2 = 25
Simplifying
d2 = 25
Take the square root of each side:
d = {-5, 5}
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