4y^2-7y+13-15y^2-7y+6=

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Solution for 4y^2-7y+13-15y^2-7y+6= equation:


Simplifying
4y2 + -7y + 13 + -15y2 + -7y + 6 = 0

Reorder the terms:
13 + 6 + -7y + -7y + 4y2 + -15y2 = 0

Combine like terms: 13 + 6 = 19
19 + -7y + -7y + 4y2 + -15y2 = 0

Combine like terms: -7y + -7y = -14y
19 + -14y + 4y2 + -15y2 = 0

Combine like terms: 4y2 + -15y2 = -11y2
19 + -14y + -11y2 = 0

Solving
19 + -14y + -11y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-11 the coefficient of the squared term: 

Divide each side by '-11'.
-1.727272727 + 1.272727273y + y2 = 0

Move the constant term to the right:

Add '1.727272727' to each side of the equation.
-1.727272727 + 1.272727273y + 1.727272727 + y2 = 0 + 1.727272727

Reorder the terms:
-1.727272727 + 1.727272727 + 1.272727273y + y2 = 0 + 1.727272727

Combine like terms: -1.727272727 + 1.727272727 = 0.000000000
0.000000000 + 1.272727273y + y2 = 0 + 1.727272727
1.272727273y + y2 = 0 + 1.727272727

Combine like terms: 0 + 1.727272727 = 1.727272727
1.272727273y + y2 = 1.727272727

The y term is 1.272727273y.  Take half its coefficient (0.6363636365).
Square it (0.4049586779) and add it to both sides.

Add '0.4049586779' to each side of the equation.
1.272727273y + 0.4049586779 + y2 = 1.727272727 + 0.4049586779

Reorder the terms:
0.4049586779 + 1.272727273y + y2 = 1.727272727 + 0.4049586779

Combine like terms: 1.727272727 + 0.4049586779 = 2.1322314049
0.4049586779 + 1.272727273y + y2 = 2.1322314049

Factor a perfect square on the left side:
(y + 0.6363636365)(y + 0.6363636365) = 2.1322314049

Calculate the square root of the right side: 1.460216219

Break this problem into two subproblems by setting 
(y + 0.6363636365) equal to 1.460216219 and -1.460216219.

Subproblem 1

y + 0.6363636365 = 1.460216219 Simplifying y + 0.6363636365 = 1.460216219 Reorder the terms: 0.6363636365 + y = 1.460216219 Solving 0.6363636365 + y = 1.460216219 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.6363636365' to each side of the equation. 0.6363636365 + -0.6363636365 + y = 1.460216219 + -0.6363636365 Combine like terms: 0.6363636365 + -0.6363636365 = 0.0000000000 0.0000000000 + y = 1.460216219 + -0.6363636365 y = 1.460216219 + -0.6363636365 Combine like terms: 1.460216219 + -0.6363636365 = 0.8238525825 y = 0.8238525825 Simplifying y = 0.8238525825

Subproblem 2

y + 0.6363636365 = -1.460216219 Simplifying y + 0.6363636365 = -1.460216219 Reorder the terms: 0.6363636365 + y = -1.460216219 Solving 0.6363636365 + y = -1.460216219 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.6363636365' to each side of the equation. 0.6363636365 + -0.6363636365 + y = -1.460216219 + -0.6363636365 Combine like terms: 0.6363636365 + -0.6363636365 = 0.0000000000 0.0000000000 + y = -1.460216219 + -0.6363636365 y = -1.460216219 + -0.6363636365 Combine like terms: -1.460216219 + -0.6363636365 = -2.0965798555 y = -2.0965798555 Simplifying y = -2.0965798555

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.8238525825, -2.0965798555}

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