20d^2-10d=100

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Solution for 20d^2-10d=100 equation:


Simplifying
20d2 + -10d = 100

Reorder the terms:
-10d + 20d2 = 100

Solving
-10d + 20d2 = 100

Solving for variable 'd'.

Reorder the terms:
-100 + -10d + 20d2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + -10d + 20d2 = 0

Factor out the Greatest Common Factor (GCF), '10'.
10(-10 + -1d + 2d2) = 0

Factor a trinomial.
10((-2 + -1d)(5 + -2d)) = 0

Ignore the factor 10.

Subproblem 1

Set the factor '(-2 + -1d)' equal to zero and attempt to solve: Simplifying -2 + -1d = 0 Solving -2 + -1d = 0 Move all terms containing d to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1d = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -1d = 0 + 2 -1d = 0 + 2 Combine like terms: 0 + 2 = 2 -1d = 2 Divide each side by '-1'. d = -2 Simplifying d = -2

Subproblem 2

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

Solution

d = {-2, 2.5}

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