(4x^2-7x+3)-(2x^2+9x-8)=

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Solution for (4x^2-7x+3)-(2x^2+9x-8)= equation:


Simplifying
(4x2 + -7x + 3) + -1(2x2 + 9x + -8) = 0

Reorder the terms:
(3 + -7x + 4x2) + -1(2x2 + 9x + -8) = 0

Remove parenthesis around (3 + -7x + 4x2)
3 + -7x + 4x2 + -1(2x2 + 9x + -8) = 0

Reorder the terms:
3 + -7x + 4x2 + -1(-8 + 9x + 2x2) = 0
3 + -7x + 4x2 + (-8 * -1 + 9x * -1 + 2x2 * -1) = 0
3 + -7x + 4x2 + (8 + -9x + -2x2) = 0

Reorder the terms:
3 + 8 + -7x + -9x + 4x2 + -2x2 = 0

Combine like terms: 3 + 8 = 11
11 + -7x + -9x + 4x2 + -2x2 = 0

Combine like terms: -7x + -9x = -16x
11 + -16x + 4x2 + -2x2 = 0

Combine like terms: 4x2 + -2x2 = 2x2
11 + -16x + 2x2 = 0

Solving
11 + -16x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
5.5 + -8x + x2 = 0

Move the constant term to the right:

Add '-5.5' to each side of the equation.
5.5 + -8x + -5.5 + x2 = 0 + -5.5

Reorder the terms:
5.5 + -5.5 + -8x + x2 = 0 + -5.5

Combine like terms: 5.5 + -5.5 = 0.0
0.0 + -8x + x2 = 0 + -5.5
-8x + x2 = 0 + -5.5

Combine like terms: 0 + -5.5 = -5.5
-8x + x2 = -5.5

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -5.5 + 16

Reorder the terms:
16 + -8x + x2 = -5.5 + 16

Combine like terms: -5.5 + 16 = 10.5
16 + -8x + x2 = 10.5

Factor a perfect square on the left side:
(x + -4)(x + -4) = 10.5

Calculate the square root of the right side: 3.240370349

Break this problem into two subproblems by setting 
(x + -4) equal to 3.240370349 and -3.240370349.

Subproblem 1

x + -4 = 3.240370349 Simplifying x + -4 = 3.240370349 Reorder the terms: -4 + x = 3.240370349 Solving -4 + x = 3.240370349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 3.240370349 + 4 Combine like terms: -4 + 4 = 0 0 + x = 3.240370349 + 4 x = 3.240370349 + 4 Combine like terms: 3.240370349 + 4 = 7.240370349 x = 7.240370349 Simplifying x = 7.240370349

Subproblem 2

x + -4 = -3.240370349 Simplifying x + -4 = -3.240370349 Reorder the terms: -4 + x = -3.240370349 Solving -4 + x = -3.240370349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -3.240370349 + 4 Combine like terms: -4 + 4 = 0 0 + x = -3.240370349 + 4 x = -3.240370349 + 4 Combine like terms: -3.240370349 + 4 = 0.759629651 x = 0.759629651 Simplifying x = 0.759629651

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.240370349, 0.759629651}

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