r^2=14r-40

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Solution for r^2=14r-40 equation:


Simplifying
r2 = 14r + -40

Reorder the terms:
r2 = -40 + 14r

Solving
r2 = -40 + 14r

Solving for variable 'r'.

Reorder the terms:
40 + -14r + r2 = -40 + 14r + 40 + -14r

Reorder the terms:
40 + -14r + r2 = -40 + 40 + 14r + -14r

Combine like terms: -40 + 40 = 0
40 + -14r + r2 = 0 + 14r + -14r
40 + -14r + r2 = 14r + -14r

Combine like terms: 14r + -14r = 0
40 + -14r + r2 = 0

Factor a trinomial.
(4 + -1r)(10 + -1r) = 0

Subproblem 1

Set the factor '(4 + -1r)' equal to zero and attempt to solve: Simplifying 4 + -1r = 0 Solving 4 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1r = 0 + -4 -1r = 0 + -4 Combine like terms: 0 + -4 = -4 -1r = -4 Divide each side by '-1'. r = 4 Simplifying r = 4

Subproblem 2

Set the factor '(10 + -1r)' equal to zero and attempt to solve: Simplifying 10 + -1r = 0 Solving 10 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -1r = 0 + -10 Combine like terms: 10 + -10 = 0 0 + -1r = 0 + -10 -1r = 0 + -10 Combine like terms: 0 + -10 = -10 -1r = -10 Divide each side by '-1'. r = 10 Simplifying r = 10

Solution

r = {4, 10}

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