4x^2=-7x-2

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Solution for 4x^2=-7x-2 equation:


Simplifying
4x2 = -7x + -2

Reorder the terms:
4x2 = -2 + -7x

Solving
4x2 = -2 + -7x

Solving for variable 'x'.

Reorder the terms:
2 + 7x + 4x2 = -2 + -7x + 2 + 7x

Reorder the terms:
2 + 7x + 4x2 = -2 + 2 + -7x + 7x

Combine like terms: -2 + 2 = 0
2 + 7x + 4x2 = 0 + -7x + 7x
2 + 7x + 4x2 = -7x + 7x

Combine like terms: -7x + 7x = 0
2 + 7x + 4x2 = 0

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

Divide each side by '4'.
0.5 + 1.75x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 1.75x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 1.75x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 1.75x + x2 = 0 + -0.5
1.75x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
1.75x + x2 = -0.5

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 = -0.5 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = -0.5 + 0.765625

Combine like terms: -0.5 + 0.765625 = 0.265625
0.765625 + 1.75x + x2 = 0.265625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 0.265625

Calculate the square root of the right side: 0.515388203

Break this problem into two subproblems by setting 
(x + 0.875) equal to 0.515388203 and -0.515388203.

Subproblem 1

x + 0.875 = 0.515388203 Simplifying x + 0.875 = 0.515388203 Reorder the terms: 0.875 + x = 0.515388203 Solving 0.875 + x = 0.515388203 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 = 0.515388203 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 0.515388203 + -0.875 x = 0.515388203 + -0.875 Combine like terms: 0.515388203 + -0.875 = -0.359611797 x = -0.359611797 Simplifying x = -0.359611797

Subproblem 2

x + 0.875 = -0.515388203 Simplifying x + 0.875 = -0.515388203 Reorder the terms: 0.875 + x = -0.515388203 Solving 0.875 + x = -0.515388203 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 = -0.515388203 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -0.515388203 + -0.875 x = -0.515388203 + -0.875 Combine like terms: -0.515388203 + -0.875 = -1.390388203 x = -1.390388203 Simplifying x = -1.390388203

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.359611797, -1.390388203}

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