(9d+11)(d+9)=79

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Solution for (9d+11)(d+9)=79 equation:


Simplifying
(9d + 11)(d + 9) = 79

Reorder the terms:
(11 + 9d)(d + 9) = 79

Reorder the terms:
(11 + 9d)(9 + d) = 79

Multiply (11 + 9d) * (9 + d)
(11(9 + d) + 9d * (9 + d)) = 79
((9 * 11 + d * 11) + 9d * (9 + d)) = 79
((99 + 11d) + 9d * (9 + d)) = 79
(99 + 11d + (9 * 9d + d * 9d)) = 79
(99 + 11d + (81d + 9d2)) = 79

Combine like terms: 11d + 81d = 92d
(99 + 92d + 9d2) = 79

Solving
99 + 92d + 9d2 = 79

Solving for variable 'd'.

Reorder the terms:
99 + -79 + 92d + 9d2 = 79 + -79

Combine like terms: 99 + -79 = 20
20 + 92d + 9d2 = 79 + -79

Combine like terms: 79 + -79 = 0
20 + 92d + 9d2 = 0

Factor a trinomial.
(10 + d)(2 + 9d) = 0

Subproblem 1

Set the factor '(10 + d)' equal to zero and attempt to solve: Simplifying 10 + d = 0 Solving 10 + d = 0 Move all terms containing d to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + d = 0 + -10 Combine like terms: 10 + -10 = 0 0 + d = 0 + -10 d = 0 + -10 Combine like terms: 0 + -10 = -10 d = -10 Simplifying d = -10

Subproblem 2

Set the factor '(2 + 9d)' equal to zero and attempt to solve: Simplifying 2 + 9d = 0 Solving 2 + 9d = 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 + 9d = 0 + -2 Combine like terms: 2 + -2 = 0 0 + 9d = 0 + -2 9d = 0 + -2 Combine like terms: 0 + -2 = -2 9d = -2 Divide each side by '9'. d = -0.2222222222 Simplifying d = -0.2222222222

Solution

d = {-10, -0.2222222222}

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