(y^2)-1.5y-7=0

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Solution for (y^2)-1.5y-7=0 equation:


Simplifying
(y2) + -1.5y + -7 = 0
y2 + -1.5y + -7 = 0

Reorder the terms:
-7 + -1.5y + y2 = 0

Solving
-7 + -1.5y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -1.5y + 7 + y2 = 0 + 7

Reorder the terms:
-7 + 7 + -1.5y + y2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -1.5y + y2 = 0 + 7
-1.5y + y2 = 0 + 7

Combine like terms: 0 + 7 = 7
-1.5y + y2 = 7

The y term is -1.5y.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5y + 0.5625 + y2 = 7 + 0.5625

Reorder the terms:
0.5625 + -1.5y + y2 = 7 + 0.5625

Combine like terms: 7 + 0.5625 = 7.5625
0.5625 + -1.5y + y2 = 7.5625

Factor a perfect square on the left side:
(y + -0.75)(y + -0.75) = 7.5625

Calculate the square root of the right side: 2.75

Break this problem into two subproblems by setting 
(y + -0.75) equal to 2.75 and -2.75.

Subproblem 1

y + -0.75 = 2.75 Simplifying y + -0.75 = 2.75 Reorder the terms: -0.75 + y = 2.75 Solving -0.75 + y = 2.75 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + y = 2.75 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + y = 2.75 + 0.75 y = 2.75 + 0.75 Combine like terms: 2.75 + 0.75 = 3.5 y = 3.5 Simplifying y = 3.5

Subproblem 2

y + -0.75 = -2.75 Simplifying y + -0.75 = -2.75 Reorder the terms: -0.75 + y = -2.75 Solving -0.75 + y = -2.75 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + y = -2.75 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + y = -2.75 + 0.75 y = -2.75 + 0.75 Combine like terms: -2.75 + 0.75 = -2 y = -2 Simplifying y = -2

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.5, -2}

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