3.5(y^2+4y-5)+2.4y^2+4.6=

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Solution for 3.5(y^2+4y-5)+2.4y^2+4.6= equation:


Simplifying
3.5(y2 + 4y + -5) + 2.4y2 + 4.6 = 0

Reorder the terms:
3.5(-5 + 4y + y2) + 2.4y2 + 4.6 = 0
(-5 * 3.5 + 4y * 3.5 + y2 * 3.5) + 2.4y2 + 4.6 = 0
(-17.5 + 14y + 3.5y2) + 2.4y2 + 4.6 = 0

Reorder the terms:
-17.5 + 4.6 + 14y + 3.5y2 + 2.4y2 = 0

Combine like terms: -17.5 + 4.6 = -12.9
-12.9 + 14y + 3.5y2 + 2.4y2 = 0

Combine like terms: 3.5y2 + 2.4y2 = 5.9y2
-12.9 + 14y + 5.9y2 = 0

Solving
-12.9 + 14y + 5.9y2 = 0

Solving for variable 'y'.

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

Divide each side by '5.9'.
-2.186440678 + 2.372881356y + y2 = 0

Move the constant term to the right:

Add '2.186440678' to each side of the equation.
-2.186440678 + 2.372881356y + 2.186440678 + y2 = 0 + 2.186440678

Reorder the terms:
-2.186440678 + 2.186440678 + 2.372881356y + y2 = 0 + 2.186440678

Combine like terms: -2.186440678 + 2.186440678 = 0.000000000
0.000000000 + 2.372881356y + y2 = 0 + 2.186440678
2.372881356y + y2 = 0 + 2.186440678

Combine like terms: 0 + 2.186440678 = 2.186440678
2.372881356y + y2 = 2.186440678

The y term is 2.372881356y.  Take half its coefficient (1.186440678).
Square it (1.407641482) and add it to both sides.

Add '1.407641482' to each side of the equation.
2.372881356y + 1.407641482 + y2 = 2.186440678 + 1.407641482

Reorder the terms:
1.407641482 + 2.372881356y + y2 = 2.186440678 + 1.407641482

Combine like terms: 2.186440678 + 1.407641482 = 3.59408216
1.407641482 + 2.372881356y + y2 = 3.59408216

Factor a perfect square on the left side:
(y + 1.186440678)(y + 1.186440678) = 3.59408216

Calculate the square root of the right side: 1.895806467

Break this problem into two subproblems by setting 
(y + 1.186440678) equal to 1.895806467 and -1.895806467.

Subproblem 1

y + 1.186440678 = 1.895806467 Simplifying y + 1.186440678 = 1.895806467 Reorder the terms: 1.186440678 + y = 1.895806467 Solving 1.186440678 + y = 1.895806467 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.186440678' to each side of the equation. 1.186440678 + -1.186440678 + y = 1.895806467 + -1.186440678 Combine like terms: 1.186440678 + -1.186440678 = 0.000000000 0.000000000 + y = 1.895806467 + -1.186440678 y = 1.895806467 + -1.186440678 Combine like terms: 1.895806467 + -1.186440678 = 0.709365789 y = 0.709365789 Simplifying y = 0.709365789

Subproblem 2

y + 1.186440678 = -1.895806467 Simplifying y + 1.186440678 = -1.895806467 Reorder the terms: 1.186440678 + y = -1.895806467 Solving 1.186440678 + y = -1.895806467 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.186440678' to each side of the equation. 1.186440678 + -1.186440678 + y = -1.895806467 + -1.186440678 Combine like terms: 1.186440678 + -1.186440678 = 0.000000000 0.000000000 + y = -1.895806467 + -1.186440678 y = -1.895806467 + -1.186440678 Combine like terms: -1.895806467 + -1.186440678 = -3.082247145 y = -3.082247145 Simplifying y = -3.082247145

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.709365789, -3.082247145}

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