X*(X+5)=84

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Solution for X*(X+5)=84 equation:


Simplifying
X(X + 5) = 84

Reorder the terms:
X(5 + X) = 84
(5 * X + X * X) = 84
(5X + X2) = 84

Solving
5X + X2 = 84

Solving for variable 'X'.

Reorder the terms:
-84 + 5X + X2 = 84 + -84

Combine like terms: 84 + -84 = 0
-84 + 5X + X2 = 0

Factor a trinomial.
(-12 + -1X)(7 + -1X) = 0

Subproblem 1

Set the factor '(-12 + -1X)' equal to zero and attempt to solve: Simplifying -12 + -1X = 0 Solving -12 + -1X = 0 Move all terms containing X to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -1X = 0 + 12 Combine like terms: -12 + 12 = 0 0 + -1X = 0 + 12 -1X = 0 + 12 Combine like terms: 0 + 12 = 12 -1X = 12 Divide each side by '-1'. X = -12 Simplifying X = -12

Subproblem 2

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

Solution

X = {-12, 7}

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