y^2=18-7y

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Solution for y^2=18-7y equation:


Simplifying
y2 = 18 + -7y

Solving
y2 = 18 + -7y

Solving for variable 'y'.

Reorder the terms:
-18 + 7y + y2 = 18 + -7y + -18 + 7y

Reorder the terms:
-18 + 7y + y2 = 18 + -18 + -7y + 7y

Combine like terms: 18 + -18 = 0
-18 + 7y + y2 = 0 + -7y + 7y
-18 + 7y + y2 = -7y + 7y

Combine like terms: -7y + 7y = 0
-18 + 7y + y2 = 0

Factor a trinomial.
(-9 + -1y)(2 + -1y) = 0

Subproblem 1

Set the factor '(-9 + -1y)' equal to zero and attempt to solve: Simplifying -9 + -1y = 0 Solving -9 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1y = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1y = 0 + 9 -1y = 0 + 9 Combine like terms: 0 + 9 = 9 -1y = 9 Divide each side by '-1'. y = -9 Simplifying y = -9

Subproblem 2

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

Solution

y = {-9, 2}

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