3x^2+90x-1000=0

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Solution for 3x^2+90x-1000=0 equation:


Simplifying
3x2 + 90x + -1000 = 0

Reorder the terms:
-1000 + 90x + 3x2 = 0

Solving
-1000 + 90x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-333.3333333 + 30x + x2 = 0

Move the constant term to the right:

Add '333.3333333' to each side of the equation.
-333.3333333 + 30x + 333.3333333 + x2 = 0 + 333.3333333

Reorder the terms:
-333.3333333 + 333.3333333 + 30x + x2 = 0 + 333.3333333

Combine like terms: -333.3333333 + 333.3333333 = 0.0000000
0.0000000 + 30x + x2 = 0 + 333.3333333
30x + x2 = 0 + 333.3333333

Combine like terms: 0 + 333.3333333 = 333.3333333
30x + x2 = 333.3333333

The x term is 30x.  Take half its coefficient (15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
30x + 225 + x2 = 333.3333333 + 225

Reorder the terms:
225 + 30x + x2 = 333.3333333 + 225

Combine like terms: 333.3333333 + 225 = 558.3333333
225 + 30x + x2 = 558.3333333

Factor a perfect square on the left side:
(x + 15)(x + 15) = 558.3333333

Calculate the square root of the right side: 23.629078131

Break this problem into two subproblems by setting 
(x + 15) equal to 23.629078131 and -23.629078131.

Subproblem 1

x + 15 = 23.629078131 Simplifying x + 15 = 23.629078131 Reorder the terms: 15 + x = 23.629078131 Solving 15 + x = 23.629078131 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + x = 23.629078131 + -15 Combine like terms: 15 + -15 = 0 0 + x = 23.629078131 + -15 x = 23.629078131 + -15 Combine like terms: 23.629078131 + -15 = 8.629078131 x = 8.629078131 Simplifying x = 8.629078131

Subproblem 2

x + 15 = -23.629078131 Simplifying x + 15 = -23.629078131 Reorder the terms: 15 + x = -23.629078131 Solving 15 + x = -23.629078131 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + x = -23.629078131 + -15 Combine like terms: 15 + -15 = 0 0 + x = -23.629078131 + -15 x = -23.629078131 + -15 Combine like terms: -23.629078131 + -15 = -38.629078131 x = -38.629078131 Simplifying x = -38.629078131

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.629078131, -38.629078131}

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