4x^2-x-2=7-7x

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


Simplifying
4x2 + -1x + -2 = 7 + -7x

Reorder the terms:
-2 + -1x + 4x2 = 7 + -7x

Solving
-2 + -1x + 4x2 = 7 + -7x

Solving for variable 'x'.

Reorder the terms:
-2 + -7 + -1x + 7x + 4x2 = 7 + -7x + -7 + 7x

Combine like terms: -2 + -7 = -9
-9 + -1x + 7x + 4x2 = 7 + -7x + -7 + 7x

Combine like terms: -1x + 7x = 6x
-9 + 6x + 4x2 = 7 + -7x + -7 + 7x

Reorder the terms:
-9 + 6x + 4x2 = 7 + -7 + -7x + 7x

Combine like terms: 7 + -7 = 0
-9 + 6x + 4x2 = 0 + -7x + 7x
-9 + 6x + 4x2 = -7x + 7x

Combine like terms: -7x + 7x = 0
-9 + 6x + 4x2 = 0

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

Divide each side by '4'.
-2.25 + 1.5x + x2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + 1.5x + 2.25 + x2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + 1.5x + x2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + 1.5x + x2 = 0 + 2.25
1.5x + x2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
1.5x + x2 = 2.25

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 2.25 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 2.25 + 0.5625

Combine like terms: 2.25 + 0.5625 = 2.8125
0.5625 + 1.5x + x2 = 2.8125

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 2.8125

Calculate the square root of the right side: 1.677050983

Break this problem into two subproblems by setting 
(x + 0.75) equal to 1.677050983 and -1.677050983.

Subproblem 1

x + 0.75 = 1.677050983 Simplifying x + 0.75 = 1.677050983 Reorder the terms: 0.75 + x = 1.677050983 Solving 0.75 + x = 1.677050983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 1.677050983 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 1.677050983 + -0.75 x = 1.677050983 + -0.75 Combine like terms: 1.677050983 + -0.75 = 0.927050983 x = 0.927050983 Simplifying x = 0.927050983

Subproblem 2

x + 0.75 = -1.677050983 Simplifying x + 0.75 = -1.677050983 Reorder the terms: 0.75 + x = -1.677050983 Solving 0.75 + x = -1.677050983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -1.677050983 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -1.677050983 + -0.75 x = -1.677050983 + -0.75 Combine like terms: -1.677050983 + -0.75 = -2.427050983 x = -2.427050983 Simplifying x = -2.427050983

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.927050983, -2.427050983}

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