4x^2-9=7x-4

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Solution for 4x^2-9=7x-4 equation:


Simplifying
4x2 + -9 = 7x + -4

Reorder the terms:
-9 + 4x2 = 7x + -4

Reorder the terms:
-9 + 4x2 = -4 + 7x

Solving
-9 + 4x2 = -4 + 7x

Solving for variable 'x'.

Reorder the terms:
-9 + 4 + -7x + 4x2 = -4 + 7x + 4 + -7x

Combine like terms: -9 + 4 = -5
-5 + -7x + 4x2 = -4 + 7x + 4 + -7x

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

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

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

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

Divide each side by '4'.
-1.25 + -1.75x + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + -1.75x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + -1.75x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + -1.75x + x2 = 0 + 1.25
-1.75x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
-1.75x + x2 = 1.25

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 = 1.25 + 0.765625

Reorder the terms:
0.765625 + -1.75x + x2 = 1.25 + 0.765625

Combine like terms: 1.25 + 0.765625 = 2.015625
0.765625 + -1.75x + x2 = 2.015625

Factor a perfect square on the left side:
(x + -0.875)(x + -0.875) = 2.015625

Calculate the square root of the right side: 1.419727086

Break this problem into two subproblems by setting 
(x + -0.875) equal to 1.419727086 and -1.419727086.

Subproblem 1

x + -0.875 = 1.419727086 Simplifying x + -0.875 = 1.419727086 Reorder the terms: -0.875 + x = 1.419727086 Solving -0.875 + x = 1.419727086 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 = 1.419727086 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = 1.419727086 + 0.875 x = 1.419727086 + 0.875 Combine like terms: 1.419727086 + 0.875 = 2.294727086 x = 2.294727086 Simplifying x = 2.294727086

Subproblem 2

x + -0.875 = -1.419727086 Simplifying x + -0.875 = -1.419727086 Reorder the terms: -0.875 + x = -1.419727086 Solving -0.875 + x = -1.419727086 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 = -1.419727086 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = -1.419727086 + 0.875 x = -1.419727086 + 0.875 Combine like terms: -1.419727086 + 0.875 = -0.544727086 x = -0.544727086 Simplifying x = -0.544727086

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.294727086, -0.544727086}

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