(4x^2+2)+(7x+3)=71

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Solution for (4x^2+2)+(7x+3)=71 equation:


Simplifying
(4x2 + 2) + (7x + 3) = 71

Reorder the terms:
(2 + 4x2) + (7x + 3) = 71

Remove parenthesis around (2 + 4x2)
2 + 4x2 + (7x + 3) = 71

Reorder the terms:
2 + 4x2 + (3 + 7x) = 71

Remove parenthesis around (3 + 7x)
2 + 4x2 + 3 + 7x = 71

Reorder the terms:
2 + 3 + 7x + 4x2 = 71

Combine like terms: 2 + 3 = 5
5 + 7x + 4x2 = 71

Solving
5 + 7x + 4x2 = 71

Solving for variable 'x'.

Reorder the terms:
5 + -71 + 7x + 4x2 = 71 + -71

Combine like terms: 5 + -71 = -66
-66 + 7x + 4x2 = 71 + -71

Combine like terms: 71 + -71 = 0
-66 + 7x + 4x2 = 0

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

Divide each side by '4'.
-16.5 + 1.75x + x2 = 0

Move the constant term to the right:

Add '16.5' to each side of the equation.
-16.5 + 1.75x + 16.5 + x2 = 0 + 16.5

Reorder the terms:
-16.5 + 16.5 + 1.75x + x2 = 0 + 16.5

Combine like terms: -16.5 + 16.5 = 0.0
0.0 + 1.75x + x2 = 0 + 16.5
1.75x + x2 = 0 + 16.5

Combine like terms: 0 + 16.5 = 16.5
1.75x + x2 = 16.5

The x term is 1.75x.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75x + 0.765625 + x2 = 16.5 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = 16.5 + 0.765625

Combine like terms: 16.5 + 0.765625 = 17.265625
0.765625 + 1.75x + x2 = 17.265625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 17.265625

Calculate the square root of the right side: 4.155192535

Break this problem into two subproblems by setting 
(x + 0.875) equal to 4.155192535 and -4.155192535.

Subproblem 1

x + 0.875 = 4.155192535 Simplifying x + 0.875 = 4.155192535 Reorder the terms: 0.875 + x = 4.155192535 Solving 0.875 + x = 4.155192535 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = 4.155192535 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 4.155192535 + -0.875 x = 4.155192535 + -0.875 Combine like terms: 4.155192535 + -0.875 = 3.280192535 x = 3.280192535 Simplifying x = 3.280192535

Subproblem 2

x + 0.875 = -4.155192535 Simplifying x + 0.875 = -4.155192535 Reorder the terms: 0.875 + x = -4.155192535 Solving 0.875 + x = -4.155192535 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = -4.155192535 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -4.155192535 + -0.875 x = -4.155192535 + -0.875 Combine like terms: -4.155192535 + -0.875 = -5.030192535 x = -5.030192535 Simplifying x = -5.030192535

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.280192535, -5.030192535}

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