x(-2x)+3x+10=0

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Solution for x(-2x)+3x+10=0 equation:


Simplifying
x(-2x) + 3x + 10 = 0

Remove parenthesis around (-2x)
x * -2x + 3x + 10 = 0

Reorder the terms for easier multiplication:
-2x * x + 3x + 10 = 0

Multiply x * x
-2x2 + 3x + 10 = 0

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

Solving
10 + 3x + -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 + -1.5x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -1.5x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -1.5x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -1.5x + x2 = 0 + 5
-1.5x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-1.5x + x2 = 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 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 5 + 0.5625

Combine like terms: 5 + 0.5625 = 5.5625
0.5625 + -1.5x + x2 = 5.5625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 5.5625

Calculate the square root of the right side: 2.358495283

Break this problem into two subproblems by setting 
(x + -0.75) equal to 2.358495283 and -2.358495283.

Subproblem 1

x + -0.75 = 2.358495283 Simplifying x + -0.75 = 2.358495283 Reorder the terms: -0.75 + x = 2.358495283 Solving -0.75 + x = 2.358495283 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 = 2.358495283 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 2.358495283 + 0.75 x = 2.358495283 + 0.75 Combine like terms: 2.358495283 + 0.75 = 3.108495283 x = 3.108495283 Simplifying x = 3.108495283

Subproblem 2

x + -0.75 = -2.358495283 Simplifying x + -0.75 = -2.358495283 Reorder the terms: -0.75 + x = -2.358495283 Solving -0.75 + x = -2.358495283 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 = -2.358495283 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -2.358495283 + 0.75 x = -2.358495283 + 0.75 Combine like terms: -2.358495283 + 0.75 = -1.608495283 x = -1.608495283 Simplifying x = -1.608495283

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.108495283, -1.608495283}

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