(3x^2-4x+17)+(7x^2+7x-75)=

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Solution for (3x^2-4x+17)+(7x^2+7x-75)= equation:


Simplifying
(3x2 + -4x + 17) + (7x2 + 7x + -75) = 0

Reorder the terms:
(17 + -4x + 3x2) + (7x2 + 7x + -75) = 0

Remove parenthesis around (17 + -4x + 3x2)
17 + -4x + 3x2 + (7x2 + 7x + -75) = 0

Reorder the terms:
17 + -4x + 3x2 + (-75 + 7x + 7x2) = 0

Remove parenthesis around (-75 + 7x + 7x2)
17 + -4x + 3x2 + -75 + 7x + 7x2 = 0

Reorder the terms:
17 + -75 + -4x + 7x + 3x2 + 7x2 = 0

Combine like terms: 17 + -75 = -58
-58 + -4x + 7x + 3x2 + 7x2 = 0

Combine like terms: -4x + 7x = 3x
-58 + 3x + 3x2 + 7x2 = 0

Combine like terms: 3x2 + 7x2 = 10x2
-58 + 3x + 10x2 = 0

Solving
-58 + 3x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-5.8 + 0.3x + x2 = 0.0

Move the constant term to the right:

Add '5.8' to each side of the equation.
-5.8 + 0.3x + 5.8 + x2 = 0.0 + 5.8

Reorder the terms:
-5.8 + 5.8 + 0.3x + x2 = 0.0 + 5.8

Combine like terms: -5.8 + 5.8 = 0.0
0.0 + 0.3x + x2 = 0.0 + 5.8
0.3x + x2 = 0.0 + 5.8

Combine like terms: 0.0 + 5.8 = 5.8
0.3x + x2 = 5.8

The x term is 0.3x.  Take half its coefficient (0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
0.3x + 0.0225 + x2 = 5.8 + 0.0225

Reorder the terms:
0.0225 + 0.3x + x2 = 5.8 + 0.0225

Combine like terms: 5.8 + 0.0225 = 5.8225
0.0225 + 0.3x + x2 = 5.8225

Factor a perfect square on the left side:
(x + 0.15)(x + 0.15) = 5.8225

Calculate the square root of the right side: 2.412985702

Break this problem into two subproblems by setting 
(x + 0.15) equal to 2.412985702 and -2.412985702.

Subproblem 1

x + 0.15 = 2.412985702 Simplifying x + 0.15 = 2.412985702 Reorder the terms: 0.15 + x = 2.412985702 Solving 0.15 + x = 2.412985702 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.15' to each side of the equation. 0.15 + -0.15 + x = 2.412985702 + -0.15 Combine like terms: 0.15 + -0.15 = 0.00 0.00 + x = 2.412985702 + -0.15 x = 2.412985702 + -0.15 Combine like terms: 2.412985702 + -0.15 = 2.262985702 x = 2.262985702 Simplifying x = 2.262985702

Subproblem 2

x + 0.15 = -2.412985702 Simplifying x + 0.15 = -2.412985702 Reorder the terms: 0.15 + x = -2.412985702 Solving 0.15 + x = -2.412985702 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.15' to each side of the equation. 0.15 + -0.15 + x = -2.412985702 + -0.15 Combine like terms: 0.15 + -0.15 = 0.00 0.00 + x = -2.412985702 + -0.15 x = -2.412985702 + -0.15 Combine like terms: -2.412985702 + -0.15 = -2.562985702 x = -2.562985702 Simplifying x = -2.562985702

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.262985702, -2.562985702}

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