(5y+2)(5y+2)=98

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Solution for (5y+2)(5y+2)=98 equation:


Simplifying
(5y + 2)(5y + 2) = 98

Reorder the terms:
(2 + 5y)(5y + 2) = 98

Reorder the terms:
(2 + 5y)(2 + 5y) = 98

Multiply (2 + 5y) * (2 + 5y)
(2(2 + 5y) + 5y * (2 + 5y)) = 98
((2 * 2 + 5y * 2) + 5y * (2 + 5y)) = 98
((4 + 10y) + 5y * (2 + 5y)) = 98
(4 + 10y + (2 * 5y + 5y * 5y)) = 98
(4 + 10y + (10y + 25y2)) = 98

Combine like terms: 10y + 10y = 20y
(4 + 20y + 25y2) = 98

Solving
4 + 20y + 25y2 = 98

Solving for variable 'y'.

Reorder the terms:
4 + -98 + 20y + 25y2 = 98 + -98

Combine like terms: 4 + -98 = -94
-94 + 20y + 25y2 = 98 + -98

Combine like terms: 98 + -98 = 0
-94 + 20y + 25y2 = 0

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

Divide each side by '25'.
-3.76 + 0.8y + y2 = 0

Move the constant term to the right:

Add '3.76' to each side of the equation.
-3.76 + 0.8y + 3.76 + y2 = 0 + 3.76

Reorder the terms:
-3.76 + 3.76 + 0.8y + y2 = 0 + 3.76

Combine like terms: -3.76 + 3.76 = 0.00
0.00 + 0.8y + y2 = 0 + 3.76
0.8y + y2 = 0 + 3.76

Combine like terms: 0 + 3.76 = 3.76
0.8y + y2 = 3.76

The y term is 0.8y.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8y + 0.16 + y2 = 3.76 + 0.16

Reorder the terms:
0.16 + 0.8y + y2 = 3.76 + 0.16

Combine like terms: 3.76 + 0.16 = 3.92
0.16 + 0.8y + y2 = 3.92

Factor a perfect square on the left side:
(y + 0.4)(y + 0.4) = 3.92

Calculate the square root of the right side: 1.979898987

Break this problem into two subproblems by setting 
(y + 0.4) equal to 1.979898987 and -1.979898987.

Subproblem 1

y + 0.4 = 1.979898987 Simplifying y + 0.4 = 1.979898987 Reorder the terms: 0.4 + y = 1.979898987 Solving 0.4 + y = 1.979898987 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + y = 1.979898987 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + y = 1.979898987 + -0.4 y = 1.979898987 + -0.4 Combine like terms: 1.979898987 + -0.4 = 1.579898987 y = 1.579898987 Simplifying y = 1.579898987

Subproblem 2

y + 0.4 = -1.979898987 Simplifying y + 0.4 = -1.979898987 Reorder the terms: 0.4 + y = -1.979898987 Solving 0.4 + y = -1.979898987 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + y = -1.979898987 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + y = -1.979898987 + -0.4 y = -1.979898987 + -0.4 Combine like terms: -1.979898987 + -0.4 = -2.379898987 y = -2.379898987 Simplifying y = -2.379898987

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.579898987, -2.379898987}

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