(-4x^2+10x+15)+(3x^2-2x-4)=

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Solution for (-4x^2+10x+15)+(3x^2-2x-4)= equation:


Simplifying
(-4x2 + 10x + 15) + (3x2 + -2x + -4) = 0

Reorder the terms:
(15 + 10x + -4x2) + (3x2 + -2x + -4) = 0

Remove parenthesis around (15 + 10x + -4x2)
15 + 10x + -4x2 + (3x2 + -2x + -4) = 0

Reorder the terms:
15 + 10x + -4x2 + (-4 + -2x + 3x2) = 0

Remove parenthesis around (-4 + -2x + 3x2)
15 + 10x + -4x2 + -4 + -2x + 3x2 = 0

Reorder the terms:
15 + -4 + 10x + -2x + -4x2 + 3x2 = 0

Combine like terms: 15 + -4 = 11
11 + 10x + -2x + -4x2 + 3x2 = 0

Combine like terms: 10x + -2x = 8x
11 + 8x + -4x2 + 3x2 = 0

Combine like terms: -4x2 + 3x2 = -1x2
11 + 8x + -1x2 = 0

Solving
11 + 8x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-11 + -8x + x2 = 0

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + -8x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + -8x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + -8x + x2 = 0 + 11
-8x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
-8x + x2 = 11

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 = 11 + 16

Reorder the terms:
16 + -8x + x2 = 11 + 16

Combine like terms: 11 + 16 = 27
16 + -8x + x2 = 27

Factor a perfect square on the left side:
(x + -4)(x + -4) = 27

Calculate the square root of the right side: 5.196152423

Break this problem into two subproblems by setting 
(x + -4) equal to 5.196152423 and -5.196152423.

Subproblem 1

x + -4 = 5.196152423 Simplifying x + -4 = 5.196152423 Reorder the terms: -4 + x = 5.196152423 Solving -4 + x = 5.196152423 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 = 5.196152423 + 4 Combine like terms: -4 + 4 = 0 0 + x = 5.196152423 + 4 x = 5.196152423 + 4 Combine like terms: 5.196152423 + 4 = 9.196152423 x = 9.196152423 Simplifying x = 9.196152423

Subproblem 2

x + -4 = -5.196152423 Simplifying x + -4 = -5.196152423 Reorder the terms: -4 + x = -5.196152423 Solving -4 + x = -5.196152423 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 = -5.196152423 + 4 Combine like terms: -4 + 4 = 0 0 + x = -5.196152423 + 4 x = -5.196152423 + 4 Combine like terms: -5.196152423 + 4 = -1.196152423 x = -1.196152423 Simplifying x = -1.196152423

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.196152423, -1.196152423}

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