0=-y^2-70y+1225

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Solution for 0=-y^2-70y+1225 equation:


Simplifying
0 = -1y2 + -70y + 1225

Reorder the terms:
0 = 1225 + -70y + -1y2

Solving
0 = 1225 + -70y + -1y2

Solving for variable 'y'.

Combine like terms: 0 + -1225 = -1225
-1225 + 70y + y2 = 1225 + -70y + -1y2 + -1225 + 70y + y2

Reorder the terms:
-1225 + 70y + y2 = 1225 + -1225 + -70y + 70y + -1y2 + y2

Combine like terms: 1225 + -1225 = 0
-1225 + 70y + y2 = 0 + -70y + 70y + -1y2 + y2
-1225 + 70y + y2 = -70y + 70y + -1y2 + y2

Combine like terms: -70y + 70y = 0
-1225 + 70y + y2 = 0 + -1y2 + y2
-1225 + 70y + y2 = -1y2 + y2

Combine like terms: -1y2 + y2 = 0
-1225 + 70y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1225' to each side of the equation.
-1225 + 70y + 1225 + y2 = 0 + 1225

Reorder the terms:
-1225 + 1225 + 70y + y2 = 0 + 1225

Combine like terms: -1225 + 1225 = 0
0 + 70y + y2 = 0 + 1225
70y + y2 = 0 + 1225

Combine like terms: 0 + 1225 = 1225
70y + y2 = 1225

The y term is 70y.  Take half its coefficient (35).
Square it (1225) and add it to both sides.

Add '1225' to each side of the equation.
70y + 1225 + y2 = 1225 + 1225

Reorder the terms:
1225 + 70y + y2 = 1225 + 1225

Combine like terms: 1225 + 1225 = 2450
1225 + 70y + y2 = 2450

Factor a perfect square on the left side:
(y + 35)(y + 35) = 2450

Calculate the square root of the right side: 49.497474683

Break this problem into two subproblems by setting 
(y + 35) equal to 49.497474683 and -49.497474683.

Subproblem 1

y + 35 = 49.497474683 Simplifying y + 35 = 49.497474683 Reorder the terms: 35 + y = 49.497474683 Solving 35 + y = 49.497474683 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + y = 49.497474683 + -35 Combine like terms: 35 + -35 = 0 0 + y = 49.497474683 + -35 y = 49.497474683 + -35 Combine like terms: 49.497474683 + -35 = 14.497474683 y = 14.497474683 Simplifying y = 14.497474683

Subproblem 2

y + 35 = -49.497474683 Simplifying y + 35 = -49.497474683 Reorder the terms: 35 + y = -49.497474683 Solving 35 + y = -49.497474683 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + y = -49.497474683 + -35 Combine like terms: 35 + -35 = 0 0 + y = -49.497474683 + -35 y = -49.497474683 + -35 Combine like terms: -49.497474683 + -35 = -84.497474683 y = -84.497474683 Simplifying y = -84.497474683

Solution

The solution to the problem is based on the solutions from the subproblems. y = {14.497474683, -84.497474683}

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