(3x^2-5x+10)+(2x^2+8x-40)=

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Solution for (3x^2-5x+10)+(2x^2+8x-40)= equation:


Simplifying
(3x2 + -5x + 10) + (2x2 + 8x + -40) = 0

Reorder the terms:
(10 + -5x + 3x2) + (2x2 + 8x + -40) = 0

Remove parenthesis around (10 + -5x + 3x2)
10 + -5x + 3x2 + (2x2 + 8x + -40) = 0

Reorder the terms:
10 + -5x + 3x2 + (-40 + 8x + 2x2) = 0

Remove parenthesis around (-40 + 8x + 2x2)
10 + -5x + 3x2 + -40 + 8x + 2x2 = 0

Reorder the terms:
10 + -40 + -5x + 8x + 3x2 + 2x2 = 0

Combine like terms: 10 + -40 = -30
-30 + -5x + 8x + 3x2 + 2x2 = 0

Combine like terms: -5x + 8x = 3x
-30 + 3x + 3x2 + 2x2 = 0

Combine like terms: 3x2 + 2x2 = 5x2
-30 + 3x + 5x2 = 0

Solving
-30 + 3x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-6 + 0.6x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 0.6x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + 0.6x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 0.6x + x2 = 0 + 6
0.6x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
0.6x + x2 = 6

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 6 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 6 + 0.09

Combine like terms: 6 + 0.09 = 6.09
0.09 + 0.6x + x2 = 6.09

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 6.09

Calculate the square root of the right side: 2.467792536

Break this problem into two subproblems by setting 
(x + 0.3) equal to 2.467792536 and -2.467792536.

Subproblem 1

x + 0.3 = 2.467792536 Simplifying x + 0.3 = 2.467792536 Reorder the terms: 0.3 + x = 2.467792536 Solving 0.3 + x = 2.467792536 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 2.467792536 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 2.467792536 + -0.3 x = 2.467792536 + -0.3 Combine like terms: 2.467792536 + -0.3 = 2.167792536 x = 2.167792536 Simplifying x = 2.167792536

Subproblem 2

x + 0.3 = -2.467792536 Simplifying x + 0.3 = -2.467792536 Reorder the terms: 0.3 + x = -2.467792536 Solving 0.3 + x = -2.467792536 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -2.467792536 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -2.467792536 + -0.3 x = -2.467792536 + -0.3 Combine like terms: -2.467792536 + -0.3 = -2.767792536 x = -2.767792536 Simplifying x = -2.767792536

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.167792536, -2.767792536}

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