7x^2=4x+5

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Solution for 7x^2=4x+5 equation:


Simplifying
7x2 = 4x + 5

Reorder the terms:
7x2 = 5 + 4x

Solving
7x2 = 5 + 4x

Solving for variable 'x'.

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

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

Combine like terms: 5 + -5 = 0
-5 + -4x + 7x2 = 0 + 4x + -4x
-5 + -4x + 7x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-5 + -4x + 7x2 = 0

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

Divide each side by '7'.
-0.7142857143 + -0.5714285714x + x2 = 0

Move the constant term to the right:

Add '0.7142857143' to each side of the equation.
-0.7142857143 + -0.5714285714x + 0.7142857143 + x2 = 0 + 0.7142857143

Reorder the terms:
-0.7142857143 + 0.7142857143 + -0.5714285714x + x2 = 0 + 0.7142857143

Combine like terms: -0.7142857143 + 0.7142857143 = 0.0000000000
0.0000000000 + -0.5714285714x + x2 = 0 + 0.7142857143
-0.5714285714x + x2 = 0 + 0.7142857143

Combine like terms: 0 + 0.7142857143 = 0.7142857143
-0.5714285714x + x2 = 0.7142857143

The x term is -0.5714285714x.  Take half its coefficient (-0.2857142857).
Square it (0.08163265305) and add it to both sides.

Add '0.08163265305' to each side of the equation.
-0.5714285714x + 0.08163265305 + x2 = 0.7142857143 + 0.08163265305

Reorder the terms:
0.08163265305 + -0.5714285714x + x2 = 0.7142857143 + 0.08163265305

Combine like terms: 0.7142857143 + 0.08163265305 = 0.79591836735
0.08163265305 + -0.5714285714x + x2 = 0.79591836735

Factor a perfect square on the left side:
(x + -0.2857142857)(x + -0.2857142857) = 0.79591836735

Calculate the square root of the right side: 0.892142571

Break this problem into two subproblems by setting 
(x + -0.2857142857) equal to 0.892142571 and -0.892142571.

Subproblem 1

x + -0.2857142857 = 0.892142571 Simplifying x + -0.2857142857 = 0.892142571 Reorder the terms: -0.2857142857 + x = 0.892142571 Solving -0.2857142857 + x = 0.892142571 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2857142857' to each side of the equation. -0.2857142857 + 0.2857142857 + x = 0.892142571 + 0.2857142857 Combine like terms: -0.2857142857 + 0.2857142857 = 0.0000000000 0.0000000000 + x = 0.892142571 + 0.2857142857 x = 0.892142571 + 0.2857142857 Combine like terms: 0.892142571 + 0.2857142857 = 1.1778568567 x = 1.1778568567 Simplifying x = 1.1778568567

Subproblem 2

x + -0.2857142857 = -0.892142571 Simplifying x + -0.2857142857 = -0.892142571 Reorder the terms: -0.2857142857 + x = -0.892142571 Solving -0.2857142857 + x = -0.892142571 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2857142857' to each side of the equation. -0.2857142857 + 0.2857142857 + x = -0.892142571 + 0.2857142857 Combine like terms: -0.2857142857 + 0.2857142857 = 0.0000000000 0.0000000000 + x = -0.892142571 + 0.2857142857 x = -0.892142571 + 0.2857142857 Combine like terms: -0.892142571 + 0.2857142857 = -0.6064282853 x = -0.6064282853 Simplifying x = -0.6064282853

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1778568567, -0.6064282853}

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