2x^2+3x=200

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Solution for 2x^2+3x=200 equation:


Simplifying
2x2 + 3x = 200

Reorder the terms:
3x + 2x2 = 200

Solving
3x + 2x2 = 200

Solving for variable 'x'.

Reorder the terms:
-200 + 3x + 2x2 = 200 + -200

Combine like terms: 200 + -200 = 0
-200 + 3x + 2x2 = 0

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

Divide each side by '2'.
-100 + 1.5x + x2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 1.5x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + 1.5x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 1.5x + x2 = 0 + 100
1.5x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
1.5x + x2 = 100

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 = 100 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 100 + 0.5625

Combine like terms: 100 + 0.5625 = 100.5625
0.5625 + 1.5x + x2 = 100.5625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 100.5625

Calculate the square root of the right side: 10.02808556

Break this problem into two subproblems by setting 
(x + 0.75) equal to 10.02808556 and -10.02808556.

Subproblem 1

x + 0.75 = 10.02808556 Simplifying x + 0.75 = 10.02808556 Reorder the terms: 0.75 + x = 10.02808556 Solving 0.75 + x = 10.02808556 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 = 10.02808556 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 10.02808556 + -0.75 x = 10.02808556 + -0.75 Combine like terms: 10.02808556 + -0.75 = 9.27808556 x = 9.27808556 Simplifying x = 9.27808556

Subproblem 2

x + 0.75 = -10.02808556 Simplifying x + 0.75 = -10.02808556 Reorder the terms: 0.75 + x = -10.02808556 Solving 0.75 + x = -10.02808556 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 = -10.02808556 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -10.02808556 + -0.75 x = -10.02808556 + -0.75 Combine like terms: -10.02808556 + -0.75 = -10.77808556 x = -10.77808556 Simplifying x = -10.77808556

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.27808556, -10.77808556}

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