5x^2+99x-30=0

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Solution for 5x^2+99x-30=0 equation:


Simplifying
5x2 + 99x + -30 = 0

Reorder the terms:
-30 + 99x + 5x2 = 0

Solving
-30 + 99x + 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 + 19.8x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 19.8x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + 19.8x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 19.8x + x2 = 0 + 6
19.8x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
19.8x + x2 = 6

The x term is 19.8x.  Take half its coefficient (9.9).
Square it (98.01) and add it to both sides.

Add '98.01' to each side of the equation.
19.8x + 98.01 + x2 = 6 + 98.01

Reorder the terms:
98.01 + 19.8x + x2 = 6 + 98.01

Combine like terms: 6 + 98.01 = 104.01
98.01 + 19.8x + x2 = 104.01

Factor a perfect square on the left side:
(x + 9.9)(x + 9.9) = 104.01

Calculate the square root of the right side: 10.198529306

Break this problem into two subproblems by setting 
(x + 9.9) equal to 10.198529306 and -10.198529306.

Subproblem 1

x + 9.9 = 10.198529306 Simplifying x + 9.9 = 10.198529306 Reorder the terms: 9.9 + x = 10.198529306 Solving 9.9 + x = 10.198529306 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9.9' to each side of the equation. 9.9 + -9.9 + x = 10.198529306 + -9.9 Combine like terms: 9.9 + -9.9 = 0.0 0.0 + x = 10.198529306 + -9.9 x = 10.198529306 + -9.9 Combine like terms: 10.198529306 + -9.9 = 0.298529306 x = 0.298529306 Simplifying x = 0.298529306

Subproblem 2

x + 9.9 = -10.198529306 Simplifying x + 9.9 = -10.198529306 Reorder the terms: 9.9 + x = -10.198529306 Solving 9.9 + x = -10.198529306 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9.9' to each side of the equation. 9.9 + -9.9 + x = -10.198529306 + -9.9 Combine like terms: 9.9 + -9.9 = 0.0 0.0 + x = -10.198529306 + -9.9 x = -10.198529306 + -9.9 Combine like terms: -10.198529306 + -9.9 = -20.098529306 x = -20.098529306 Simplifying x = -20.098529306

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.298529306, -20.098529306}

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