7y^2+42y-14=0

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Solution for 7y^2+42y-14=0 equation:


Simplifying
7y2 + 42y + -14 = 0

Reorder the terms:
-14 + 42y + 7y2 = 0

Solving
-14 + 42y + 7y2 = 0

Solving for variable 'y'.

Factor out the Greatest Common Factor (GCF), '7'.
7(-2 + 6y + y2) = 0

Ignore the factor 7.

Subproblem 1

Set the factor '(-2 + 6y + y2)' equal to zero and attempt to solve: Simplifying -2 + 6y + y2 = 0 Solving -2 + 6y + y2 = 0 Begin completing the square. Move the constant term to the right: Add '2' to each side of the equation. -2 + 6y + 2 + y2 = 0 + 2 Reorder the terms: -2 + 2 + 6y + y2 = 0 + 2 Combine like terms: -2 + 2 = 0 0 + 6y + y2 = 0 + 2 6y + y2 = 0 + 2 Combine like terms: 0 + 2 = 2 6y + y2 = 2 The y term is 6y. Take half its coefficient (3). Square it (9) and add it to both sides. Add '9' to each side of the equation. 6y + 9 + y2 = 2 + 9 Reorder the terms: 9 + 6y + y2 = 2 + 9 Combine like terms: 2 + 9 = 11 9 + 6y + y2 = 11 Factor a perfect square on the left side: (y + 3)(y + 3) = 11 Calculate the square root of the right side: 3.31662479 Break this problem into two subproblems by setting (y + 3) equal to 3.31662479 and -3.31662479.

Subproblem 1

y + 3 = 3.31662479 Simplifying y + 3 = 3.31662479 Reorder the terms: 3 + y = 3.31662479 Solving 3 + y = 3.31662479 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y = 3.31662479 + -3 Combine like terms: 3 + -3 = 0 0 + y = 3.31662479 + -3 y = 3.31662479 + -3 Combine like terms: 3.31662479 + -3 = 0.31662479 y = 0.31662479 Simplifying y = 0.31662479

Subproblem 2

y + 3 = -3.31662479 Simplifying y + 3 = -3.31662479 Reorder the terms: 3 + y = -3.31662479 Solving 3 + y = -3.31662479 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y = -3.31662479 + -3 Combine like terms: 3 + -3 = 0 0 + y = -3.31662479 + -3 y = -3.31662479 + -3 Combine like terms: -3.31662479 + -3 = -6.31662479 y = -6.31662479 Simplifying y = -6.31662479

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.31662479, -6.31662479}

Solution

y = {0.31662479, -6.31662479}

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