9y^2-21y-12=

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Solution for 9y^2-21y-12= equation:


Simplifying
9y2 + -21y + -12 = 0

Reorder the terms:
-12 + -21y + 9y2 = 0

Solving
-12 + -21y + 9y2 = 0

Solving for variable 'y'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-4 + -7y + 3y2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-4 + -7y + 3y2)' equal to zero and attempt to solve: Simplifying -4 + -7y + 3y2 = 0 Solving -4 + -7y + 3y2 = 0 Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -1.333333333 + -2.333333333y + y2 = 0 Move the constant term to the right: Add '1.333333333' to each side of the equation. -1.333333333 + -2.333333333y + 1.333333333 + y2 = 0 + 1.333333333 Reorder the terms: -1.333333333 + 1.333333333 + -2.333333333y + y2 = 0 + 1.333333333 Combine like terms: -1.333333333 + 1.333333333 = 0.000000000 0.000000000 + -2.333333333y + y2 = 0 + 1.333333333 -2.333333333y + y2 = 0 + 1.333333333 Combine like terms: 0 + 1.333333333 = 1.333333333 -2.333333333y + y2 = 1.333333333 The y term is -2.333333333y. Take half its coefficient (-1.166666667). Square it (1.361111112) and add it to both sides. Add '1.361111112' to each side of the equation. -2.333333333y + 1.361111112 + y2 = 1.333333333 + 1.361111112 Reorder the terms: 1.361111112 + -2.333333333y + y2 = 1.333333333 + 1.361111112 Combine like terms: 1.333333333 + 1.361111112 = 2.694444445 1.361111112 + -2.333333333y + y2 = 2.694444445 Factor a perfect square on the left side: (y + -1.166666667)(y + -1.166666667) = 2.694444445 Calculate the square root of the right side: 1.6414763 Break this problem into two subproblems by setting (y + -1.166666667) equal to 1.6414763 and -1.6414763.

Subproblem 1

y + -1.166666667 = 1.6414763 Simplifying y + -1.166666667 = 1.6414763 Reorder the terms: -1.166666667 + y = 1.6414763 Solving -1.166666667 + y = 1.6414763 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.166666667' to each side of the equation. -1.166666667 + 1.166666667 + y = 1.6414763 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + y = 1.6414763 + 1.166666667 y = 1.6414763 + 1.166666667 Combine like terms: 1.6414763 + 1.166666667 = 2.808142967 y = 2.808142967 Simplifying y = 2.808142967

Subproblem 2

y + -1.166666667 = -1.6414763 Simplifying y + -1.166666667 = -1.6414763 Reorder the terms: -1.166666667 + y = -1.6414763 Solving -1.166666667 + y = -1.6414763 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.166666667' to each side of the equation. -1.166666667 + 1.166666667 + y = -1.6414763 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + y = -1.6414763 + 1.166666667 y = -1.6414763 + 1.166666667 Combine like terms: -1.6414763 + 1.166666667 = -0.474809633 y = -0.474809633 Simplifying y = -0.474809633

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.808142967, -0.474809633}

Solution

y = {2.808142967, -0.474809633}

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