7r^2-12r=4

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Solution for 7r^2-12r=4 equation:


Simplifying
7r2 + -12r = 4

Reorder the terms:
-12r + 7r2 = 4

Solving
-12r + 7r2 = 4

Solving for variable 'r'.

Reorder the terms:
-4 + -12r + 7r2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + -12r + 7r2 = 0

Factor a trinomial.
(-2 + -7r)(2 + -1r) = 0

Subproblem 1

Set the factor '(-2 + -7r)' equal to zero and attempt to solve: Simplifying -2 + -7r = 0 Solving -2 + -7r = 0 Move all terms containing r to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -7r = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -7r = 0 + 2 -7r = 0 + 2 Combine like terms: 0 + 2 = 2 -7r = 2 Divide each side by '-7'. r = -0.2857142857 Simplifying r = -0.2857142857

Subproblem 2

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

Solution

r = {-0.2857142857, 2}

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