.5x^2+35x-20=0

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Solution for .5x^2+35x-20=0 equation:


Simplifying
0.5x2 + 35x + -20 = 0

Reorder the terms:
-20 + 35x + 0.5x2 = 0

Solving
-20 + 35x + 0.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.5'.
-40 + 70x + x2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 70x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + 70x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 70x + x2 = 0 + 40
70x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
70x + x2 = 40

The x term is 70x.  Take half its coefficient (35).
Square it (1225) and add it to both sides.

Add '1225' to each side of the equation.
70x + 1225 + x2 = 40 + 1225

Reorder the terms:
1225 + 70x + x2 = 40 + 1225

Combine like terms: 40 + 1225 = 1265
1225 + 70x + x2 = 1265

Factor a perfect square on the left side:
(x + 35)(x + 35) = 1265

Calculate the square root of the right side: 35.566838488

Break this problem into two subproblems by setting 
(x + 35) equal to 35.566838488 and -35.566838488.

Subproblem 1

x + 35 = 35.566838488 Simplifying x + 35 = 35.566838488 Reorder the terms: 35 + x = 35.566838488 Solving 35 + x = 35.566838488 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + x = 35.566838488 + -35 Combine like terms: 35 + -35 = 0 0 + x = 35.566838488 + -35 x = 35.566838488 + -35 Combine like terms: 35.566838488 + -35 = 0.566838488 x = 0.566838488 Simplifying x = 0.566838488

Subproblem 2

x + 35 = -35.566838488 Simplifying x + 35 = -35.566838488 Reorder the terms: 35 + x = -35.566838488 Solving 35 + x = -35.566838488 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + x = -35.566838488 + -35 Combine like terms: 35 + -35 = 0 0 + x = -35.566838488 + -35 x = -35.566838488 + -35 Combine like terms: -35.566838488 + -35 = -70.566838488 x = -70.566838488 Simplifying x = -70.566838488

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.566838488, -70.566838488}

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