7(4y^2-4y+7)-3(5y^2-2y+3)=

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Solution for 7(4y^2-4y+7)-3(5y^2-2y+3)= equation:


Simplifying
7(4y2 + -4y + 7) + -3(5y2 + -2y + 3) = 0

Reorder the terms:
7(7 + -4y + 4y2) + -3(5y2 + -2y + 3) = 0
(7 * 7 + -4y * 7 + 4y2 * 7) + -3(5y2 + -2y + 3) = 0
(49 + -28y + 28y2) + -3(5y2 + -2y + 3) = 0

Reorder the terms:
49 + -28y + 28y2 + -3(3 + -2y + 5y2) = 0
49 + -28y + 28y2 + (3 * -3 + -2y * -3 + 5y2 * -3) = 0
49 + -28y + 28y2 + (-9 + 6y + -15y2) = 0

Reorder the terms:
49 + -9 + -28y + 6y + 28y2 + -15y2 = 0

Combine like terms: 49 + -9 = 40
40 + -28y + 6y + 28y2 + -15y2 = 0

Combine like terms: -28y + 6y = -22y
40 + -22y + 28y2 + -15y2 = 0

Combine like terms: 28y2 + -15y2 = 13y2
40 + -22y + 13y2 = 0

Solving
40 + -22y + 13y2 = 0

Solving for variable 'y'.

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

Divide each side by '13'.
3.076923077 + -1.692307692y + y2 = 0

Move the constant term to the right:

Add '-3.076923077' to each side of the equation.
3.076923077 + -1.692307692y + -3.076923077 + y2 = 0 + -3.076923077

Reorder the terms:
3.076923077 + -3.076923077 + -1.692307692y + y2 = 0 + -3.076923077

Combine like terms: 3.076923077 + -3.076923077 = 0.000000000
0.000000000 + -1.692307692y + y2 = 0 + -3.076923077
-1.692307692y + y2 = 0 + -3.076923077

Combine like terms: 0 + -3.076923077 = -3.076923077
-1.692307692y + y2 = -3.076923077

The y term is -1.692307692y.  Take half its coefficient (-0.846153846).
Square it (0.7159763311) and add it to both sides.

Add '0.7159763311' to each side of the equation.
-1.692307692y + 0.7159763311 + y2 = -3.076923077 + 0.7159763311

Reorder the terms:
0.7159763311 + -1.692307692y + y2 = -3.076923077 + 0.7159763311

Combine like terms: -3.076923077 + 0.7159763311 = -2.3609467459
0.7159763311 + -1.692307692y + y2 = -2.3609467459

Factor a perfect square on the left side:
(y + -0.846153846)(y + -0.846153846) = -2.3609467459

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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