3r^2+14r+15=7

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Solution for 3r^2+14r+15=7 equation:


Simplifying
3r2 + 14r + 15 = 7

Reorder the terms:
15 + 14r + 3r2 = 7

Solving
15 + 14r + 3r2 = 7

Solving for variable 'r'.

Reorder the terms:
15 + -7 + 14r + 3r2 = 7 + -7

Combine like terms: 15 + -7 = 8
8 + 14r + 3r2 = 7 + -7

Combine like terms: 7 + -7 = 0
8 + 14r + 3r2 = 0

Factor a trinomial.
(4 + r)(2 + 3r) = 0

Subproblem 1

Set the factor '(4 + r)' equal to zero and attempt to solve: Simplifying 4 + r = 0 Solving 4 + r = 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 + r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + r = 0 + -4 r = 0 + -4 Combine like terms: 0 + -4 = -4 r = -4 Simplifying r = -4

Subproblem 2

Set the factor '(2 + 3r)' equal to zero and attempt to solve: Simplifying 2 + 3r = 0 Solving 2 + 3r = 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 + 3r = 0 + -2 Combine like terms: 2 + -2 = 0 0 + 3r = 0 + -2 3r = 0 + -2 Combine like terms: 0 + -2 = -2 3r = -2 Divide each side by '3'. r = -0.6666666667 Simplifying r = -0.6666666667

Solution

r = {-4, -0.6666666667}

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