-4y^2-7y=-10

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Solution for -4y^2-7y=-10 equation:


Simplifying
-4y2 + -7y = -10

Reorder the terms:
-7y + -4y2 = -10

Solving
-7y + -4y2 = -10

Solving for variable 'y'.

Reorder the terms:
10 + -7y + -4y2 = -10 + 10

Combine like terms: -10 + 10 = 0
10 + -7y + -4y2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-2.5 + 1.75y + y2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 1.75y + 2.5 + y2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 1.75y + y2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 1.75y + y2 = 0 + 2.5
1.75y + y2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
1.75y + y2 = 2.5

The y term is 1.75y.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75y + 0.765625 + y2 = 2.5 + 0.765625

Reorder the terms:
0.765625 + 1.75y + y2 = 2.5 + 0.765625

Combine like terms: 2.5 + 0.765625 = 3.265625
0.765625 + 1.75y + y2 = 3.265625

Factor a perfect square on the left side:
(y + 0.875)(y + 0.875) = 3.265625

Calculate the square root of the right side: 1.807104037

Break this problem into two subproblems by setting 
(y + 0.875) equal to 1.807104037 and -1.807104037.

Subproblem 1

y + 0.875 = 1.807104037 Simplifying y + 0.875 = 1.807104037 Reorder the terms: 0.875 + y = 1.807104037 Solving 0.875 + y = 1.807104037 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + y = 1.807104037 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + y = 1.807104037 + -0.875 y = 1.807104037 + -0.875 Combine like terms: 1.807104037 + -0.875 = 0.932104037 y = 0.932104037 Simplifying y = 0.932104037

Subproblem 2

y + 0.875 = -1.807104037 Simplifying y + 0.875 = -1.807104037 Reorder the terms: 0.875 + y = -1.807104037 Solving 0.875 + y = -1.807104037 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + y = -1.807104037 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + y = -1.807104037 + -0.875 y = -1.807104037 + -0.875 Combine like terms: -1.807104037 + -0.875 = -2.682104037 y = -2.682104037 Simplifying y = -2.682104037

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.932104037, -2.682104037}

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