7(3y-5)-2(10+4y^2)=

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Solution for 7(3y-5)-2(10+4y^2)= equation:


Simplifying
7(3y + -5) + -2(10 + 4y2) = 0

Reorder the terms:
7(-5 + 3y) + -2(10 + 4y2) = 0
(-5 * 7 + 3y * 7) + -2(10 + 4y2) = 0
(-35 + 21y) + -2(10 + 4y2) = 0
-35 + 21y + (10 * -2 + 4y2 * -2) = 0
-35 + 21y + (-20 + -8y2) = 0

Reorder the terms:
-35 + -20 + 21y + -8y2 = 0

Combine like terms: -35 + -20 = -55
-55 + 21y + -8y2 = 0

Solving
-55 + 21y + -8y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
6.875 + -2.625y + y2 = 0

Move the constant term to the right:

Add '-6.875' to each side of the equation.
6.875 + -2.625y + -6.875 + y2 = 0 + -6.875

Reorder the terms:
6.875 + -6.875 + -2.625y + y2 = 0 + -6.875

Combine like terms: 6.875 + -6.875 = 0.000
0.000 + -2.625y + y2 = 0 + -6.875
-2.625y + y2 = 0 + -6.875

Combine like terms: 0 + -6.875 = -6.875
-2.625y + y2 = -6.875

The y term is -2.625y.  Take half its coefficient (-1.3125).
Square it (1.72265625) and add it to both sides.

Add '1.72265625' to each side of the equation.
-2.625y + 1.72265625 + y2 = -6.875 + 1.72265625

Reorder the terms:
1.72265625 + -2.625y + y2 = -6.875 + 1.72265625

Combine like terms: -6.875 + 1.72265625 = -5.15234375
1.72265625 + -2.625y + y2 = -5.15234375

Factor a perfect square on the left side:
(y + -1.3125)(y + -1.3125) = -5.15234375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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