y^2-y-70=0

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Solution for y^2-y-70=0 equation:


Simplifying
y2 + -1y + -70 = 0

Reorder the terms:
-70 + -1y + y2 = 0

Solving
-70 + -1y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '70' to each side of the equation.
-70 + -1y + 70 + y2 = 0 + 70

Reorder the terms:
-70 + 70 + -1y + y2 = 0 + 70

Combine like terms: -70 + 70 = 0
0 + -1y + y2 = 0 + 70
-1y + y2 = 0 + 70

Combine like terms: 0 + 70 = 70
-1y + y2 = 70

The y term is -1y.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1y + 0.25 + y2 = 70 + 0.25

Reorder the terms:
0.25 + -1y + y2 = 70 + 0.25

Combine like terms: 70 + 0.25 = 70.25
0.25 + -1y + y2 = 70.25

Factor a perfect square on the left side:
(y + -0.5)(y + -0.5) = 70.25

Calculate the square root of the right side: 8.381527307

Break this problem into two subproblems by setting 
(y + -0.5) equal to 8.381527307 and -8.381527307.

Subproblem 1

y + -0.5 = 8.381527307 Simplifying y + -0.5 = 8.381527307 Reorder the terms: -0.5 + y = 8.381527307 Solving -0.5 + y = 8.381527307 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = 8.381527307 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = 8.381527307 + 0.5 y = 8.381527307 + 0.5 Combine like terms: 8.381527307 + 0.5 = 8.881527307 y = 8.881527307 Simplifying y = 8.881527307

Subproblem 2

y + -0.5 = -8.381527307 Simplifying y + -0.5 = -8.381527307 Reorder the terms: -0.5 + y = -8.381527307 Solving -0.5 + y = -8.381527307 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = -8.381527307 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = -8.381527307 + 0.5 y = -8.381527307 + 0.5 Combine like terms: -8.381527307 + 0.5 = -7.881527307 y = -7.881527307 Simplifying y = -7.881527307

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.881527307, -7.881527307}

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