5d^2-20d-105=0

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Solution for 5d^2-20d-105=0 equation:


Simplifying
5d2 + -20d + -105 = 0

Reorder the terms:
-105 + -20d + 5d2 = 0

Solving
-105 + -20d + 5d2 = 0

Solving for variable 'd'.

Factor out the Greatest Common Factor (GCF), '5'.
5(-21 + -4d + d2) = 0

Factor a trinomial.
5((-3 + -1d)(7 + -1d)) = 0

Ignore the factor 5.

Subproblem 1

Set the factor '(-3 + -1d)' equal to zero and attempt to solve: Simplifying -3 + -1d = 0 Solving -3 + -1d = 0 Move all terms containing d to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1d = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1d = 0 + 3 -1d = 0 + 3 Combine like terms: 0 + 3 = 3 -1d = 3 Divide each side by '-1'. d = -3 Simplifying d = -3

Subproblem 2

Set the factor '(7 + -1d)' equal to zero and attempt to solve: Simplifying 7 + -1d = 0 Solving 7 + -1d = 0 Move all terms containing d to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1d = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1d = 0 + -7 -1d = 0 + -7 Combine like terms: 0 + -7 = -7 -1d = -7 Divide each side by '-1'. d = 7 Simplifying d = 7

Solution

d = {-3, 7}

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