3x+4=2x^2-7

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Solution for 3x+4=2x^2-7 equation:


Simplifying
3x + 4 = 2x2 + -7

Reorder the terms:
4 + 3x = 2x2 + -7

Reorder the terms:
4 + 3x = -7 + 2x2

Solving
4 + 3x = -7 + 2x2

Solving for variable 'x'.

Reorder the terms:
4 + 7 + 3x + -2x2 = -7 + 2x2 + 7 + -2x2

Combine like terms: 4 + 7 = 11
11 + 3x + -2x2 = -7 + 2x2 + 7 + -2x2

Reorder the terms:
11 + 3x + -2x2 = -7 + 7 + 2x2 + -2x2

Combine like terms: -7 + 7 = 0
11 + 3x + -2x2 = 0 + 2x2 + -2x2
11 + 3x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
11 + 3x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-5.5 + -1.5x + x2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + -1.5x + 5.5 + x2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + -1.5x + x2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + -1.5x + x2 = 0 + 5.5
-1.5x + x2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
-1.5x + x2 = 5.5

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 = 5.5 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 5.5 + 0.5625

Combine like terms: 5.5 + 0.5625 = 6.0625
0.5625 + -1.5x + x2 = 6.0625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 6.0625

Calculate the square root of the right side: 2.46221445

Break this problem into two subproblems by setting 
(x + -0.75) equal to 2.46221445 and -2.46221445.

Subproblem 1

x + -0.75 = 2.46221445 Simplifying x + -0.75 = 2.46221445 Reorder the terms: -0.75 + x = 2.46221445 Solving -0.75 + x = 2.46221445 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 = 2.46221445 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 2.46221445 + 0.75 x = 2.46221445 + 0.75 Combine like terms: 2.46221445 + 0.75 = 3.21221445 x = 3.21221445 Simplifying x = 3.21221445

Subproblem 2

x + -0.75 = -2.46221445 Simplifying x + -0.75 = -2.46221445 Reorder the terms: -0.75 + x = -2.46221445 Solving -0.75 + x = -2.46221445 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 = -2.46221445 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -2.46221445 + 0.75 x = -2.46221445 + 0.75 Combine like terms: -2.46221445 + 0.75 = -1.71221445 x = -1.71221445 Simplifying x = -1.71221445

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.21221445, -1.71221445}

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