y^2-3y=49

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Solution for y^2-3y=49 equation:


Simplifying
y2 + -3y = 49

Reorder the terms:
-3y + y2 = 49

Solving
-3y + y2 = 49

Solving for variable 'y'.

Reorder the terms:
-49 + -3y + y2 = 49 + -49

Combine like terms: 49 + -49 = 0
-49 + -3y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '49' to each side of the equation.
-49 + -3y + 49 + y2 = 0 + 49

Reorder the terms:
-49 + 49 + -3y + y2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + -3y + y2 = 0 + 49
-3y + y2 = 0 + 49

Combine like terms: 0 + 49 = 49
-3y + y2 = 49

The y term is -3y.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3y + 2.25 + y2 = 49 + 2.25

Reorder the terms:
2.25 + -3y + y2 = 49 + 2.25

Combine like terms: 49 + 2.25 = 51.25
2.25 + -3y + y2 = 51.25

Factor a perfect square on the left side:
(y + -1.5)(y + -1.5) = 51.25

Calculate the square root of the right side: 7.158910532

Break this problem into two subproblems by setting 
(y + -1.5) equal to 7.158910532 and -7.158910532.

Subproblem 1

y + -1.5 = 7.158910532 Simplifying y + -1.5 = 7.158910532 Reorder the terms: -1.5 + y = 7.158910532 Solving -1.5 + y = 7.158910532 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y = 7.158910532 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = 7.158910532 + 1.5 y = 7.158910532 + 1.5 Combine like terms: 7.158910532 + 1.5 = 8.658910532 y = 8.658910532 Simplifying y = 8.658910532

Subproblem 2

y + -1.5 = -7.158910532 Simplifying y + -1.5 = -7.158910532 Reorder the terms: -1.5 + y = -7.158910532 Solving -1.5 + y = -7.158910532 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y = -7.158910532 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = -7.158910532 + 1.5 y = -7.158910532 + 1.5 Combine like terms: -7.158910532 + 1.5 = -5.658910532 y = -5.658910532 Simplifying y = -5.658910532

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.658910532, -5.658910532}

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