2x^2+4x-7=10

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


Simplifying
2x2 + 4x + -7 = 10

Reorder the terms:
-7 + 4x + 2x2 = 10

Solving
-7 + 4x + 2x2 = 10

Solving for variable 'x'.

Reorder the terms:
-7 + -10 + 4x + 2x2 = 10 + -10

Combine like terms: -7 + -10 = -17
-17 + 4x + 2x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-17 + 4x + 2x2 = 0

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

Divide each side by '2'.
-8.5 + 2x + x2 = 0

Move the constant term to the right:

Add '8.5' to each side of the equation.
-8.5 + 2x + 8.5 + x2 = 0 + 8.5

Reorder the terms:
-8.5 + 8.5 + 2x + x2 = 0 + 8.5

Combine like terms: -8.5 + 8.5 = 0.0
0.0 + 2x + x2 = 0 + 8.5
2x + x2 = 0 + 8.5

Combine like terms: 0 + 8.5 = 8.5
2x + x2 = 8.5

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 8.5 + 1

Reorder the terms:
1 + 2x + x2 = 8.5 + 1

Combine like terms: 8.5 + 1 = 9.5
1 + 2x + x2 = 9.5

Factor a perfect square on the left side:
(x + 1)(x + 1) = 9.5

Calculate the square root of the right side: 3.082207001

Break this problem into two subproblems by setting 
(x + 1) equal to 3.082207001 and -3.082207001.

Subproblem 1

x + 1 = 3.082207001 Simplifying x + 1 = 3.082207001 Reorder the terms: 1 + x = 3.082207001 Solving 1 + x = 3.082207001 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 3.082207001 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.082207001 + -1 x = 3.082207001 + -1 Combine like terms: 3.082207001 + -1 = 2.082207001 x = 2.082207001 Simplifying x = 2.082207001

Subproblem 2

x + 1 = -3.082207001 Simplifying x + 1 = -3.082207001 Reorder the terms: 1 + x = -3.082207001 Solving 1 + x = -3.082207001 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -3.082207001 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.082207001 + -1 x = -3.082207001 + -1 Combine like terms: -3.082207001 + -1 = -4.082207001 x = -4.082207001 Simplifying x = -4.082207001

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.082207001, -4.082207001}

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