10x^2+7x-4=0

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Solution for 10x^2+7x-4=0 equation:


Simplifying
10x2 + 7x + -4 = 0

Reorder the terms:
-4 + 7x + 10x2 = 0

Solving
-4 + 7x + 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'.
-0.4 + 0.7x + x2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + 0.7x + 0.4 + x2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + 0.7x + x2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + 0.7x + x2 = 0 + 0.4
0.7x + x2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
0.7x + x2 = 0.4

The x term is 0.7x.  Take half its coefficient (0.35).
Square it (0.1225) and add it to both sides.

Add '0.1225' to each side of the equation.
0.7x + 0.1225 + x2 = 0.4 + 0.1225

Reorder the terms:
0.1225 + 0.7x + x2 = 0.4 + 0.1225

Combine like terms: 0.4 + 0.1225 = 0.5225
0.1225 + 0.7x + x2 = 0.5225

Factor a perfect square on the left side:
(x + 0.35)(x + 0.35) = 0.5225

Calculate the square root of the right side: 0.722841615

Break this problem into two subproblems by setting 
(x + 0.35) equal to 0.722841615 and -0.722841615.

Subproblem 1

x + 0.35 = 0.722841615 Simplifying x + 0.35 = 0.722841615 Reorder the terms: 0.35 + x = 0.722841615 Solving 0.35 + x = 0.722841615 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.35' to each side of the equation. 0.35 + -0.35 + x = 0.722841615 + -0.35 Combine like terms: 0.35 + -0.35 = 0.00 0.00 + x = 0.722841615 + -0.35 x = 0.722841615 + -0.35 Combine like terms: 0.722841615 + -0.35 = 0.372841615 x = 0.372841615 Simplifying x = 0.372841615

Subproblem 2

x + 0.35 = -0.722841615 Simplifying x + 0.35 = -0.722841615 Reorder the terms: 0.35 + x = -0.722841615 Solving 0.35 + x = -0.722841615 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.35' to each side of the equation. 0.35 + -0.35 + x = -0.722841615 + -0.35 Combine like terms: 0.35 + -0.35 = 0.00 0.00 + x = -0.722841615 + -0.35 x = -0.722841615 + -0.35 Combine like terms: -0.722841615 + -0.35 = -1.072841615 x = -1.072841615 Simplifying x = -1.072841615

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.372841615, -1.072841615}

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