8d^2+28d+20=0

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Solution for 8d^2+28d+20=0 equation:


Simplifying
8d2 + 28d + 20 = 0

Reorder the terms:
20 + 28d + 8d2 = 0

Solving
20 + 28d + 8d2 = 0

Solving for variable 'd'.

Factor out the Greatest Common Factor (GCF), '4'.
4(5 + 7d + 2d2) = 0

Factor a trinomial.
4((5 + 2d)(1 + d)) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(5 + 2d)' equal to zero and attempt to solve: Simplifying 5 + 2d = 0 Solving 5 + 2d = 0 Move all terms containing d to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 2d = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 2d = 0 + -5 2d = 0 + -5 Combine like terms: 0 + -5 = -5 2d = -5 Divide each side by '2'. d = -2.5 Simplifying d = -2.5

Subproblem 2

Set the factor '(1 + d)' equal to zero and attempt to solve: Simplifying 1 + d = 0 Solving 1 + d = 0 Move all terms containing d to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + d = 0 + -1 Combine like terms: 1 + -1 = 0 0 + d = 0 + -1 d = 0 + -1 Combine like terms: 0 + -1 = -1 d = -1 Simplifying d = -1

Solution

d = {-2.5, -1}

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