7r^2+45r=28

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Solution for 7r^2+45r=28 equation:


Simplifying
7r2 + 45r = 28

Reorder the terms:
45r + 7r2 = 28

Solving
45r + 7r2 = 28

Solving for variable 'r'.

Reorder the terms:
-28 + 45r + 7r2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + 45r + 7r2 = 0

Factor a trinomial.
(-7 + -1r)(4 + -7r) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(4 + -7r)' equal to zero and attempt to solve: Simplifying 4 + -7r = 0 Solving 4 + -7r = 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 + -7r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -7r = 0 + -4 -7r = 0 + -4 Combine like terms: 0 + -4 = -4 -7r = -4 Divide each side by '-7'. r = 0.5714285714 Simplifying r = 0.5714285714

Solution

r = {-7, 0.5714285714}

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