169=5y(5y+9)

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Solution for 169=5y(5y+9) equation:


Simplifying
169 = 5y(5y + 9)

Reorder the terms:
169 = 5y(9 + 5y)
169 = (9 * 5y + 5y * 5y)
169 = (45y + 25y2)

Solving
169 = 45y + 25y2

Solving for variable 'y'.

Reorder the terms:
169 + -45y + -25y2 = 45y + -45y + 25y2 + -25y2

Combine like terms: 45y + -45y = 0
169 + -45y + -25y2 = 0 + 25y2 + -25y2
169 + -45y + -25y2 = 25y2 + -25y2

Combine like terms: 25y2 + -25y2 = 0
169 + -45y + -25y2 = 0

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

Divide each side by '-25'.
-6.76 + 1.8y + y2 = 0

Move the constant term to the right:

Add '6.76' to each side of the equation.
-6.76 + 1.8y + 6.76 + y2 = 0 + 6.76

Reorder the terms:
-6.76 + 6.76 + 1.8y + y2 = 0 + 6.76

Combine like terms: -6.76 + 6.76 = 0.00
0.00 + 1.8y + y2 = 0 + 6.76
1.8y + y2 = 0 + 6.76

Combine like terms: 0 + 6.76 = 6.76
1.8y + y2 = 6.76

The y term is 1.8y.  Take half its coefficient (0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
1.8y + 0.81 + y2 = 6.76 + 0.81

Reorder the terms:
0.81 + 1.8y + y2 = 6.76 + 0.81

Combine like terms: 6.76 + 0.81 = 7.57
0.81 + 1.8y + y2 = 7.57

Factor a perfect square on the left side:
(y + 0.9)(y + 0.9) = 7.57

Calculate the square root of the right side: 2.751363298

Break this problem into two subproblems by setting 
(y + 0.9) equal to 2.751363298 and -2.751363298.

Subproblem 1

y + 0.9 = 2.751363298 Simplifying y + 0.9 = 2.751363298 Reorder the terms: 0.9 + y = 2.751363298 Solving 0.9 + y = 2.751363298 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + y = 2.751363298 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + y = 2.751363298 + -0.9 y = 2.751363298 + -0.9 Combine like terms: 2.751363298 + -0.9 = 1.851363298 y = 1.851363298 Simplifying y = 1.851363298

Subproblem 2

y + 0.9 = -2.751363298 Simplifying y + 0.9 = -2.751363298 Reorder the terms: 0.9 + y = -2.751363298 Solving 0.9 + y = -2.751363298 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + y = -2.751363298 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + y = -2.751363298 + -0.9 y = -2.751363298 + -0.9 Combine like terms: -2.751363298 + -0.9 = -3.651363298 y = -3.651363298 Simplifying y = -3.651363298

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.851363298, -3.651363298}

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