.03x^2-.07x=40

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Solution for .03x^2-.07x=40 equation:


Simplifying
0.03x2 + -0.07x = 40

Reorder the terms:
-0.07x + 0.03x2 = 40

Solving
-0.07x + 0.03x2 = 40

Solving for variable 'x'.

Reorder the terms:
-40 + -0.07x + 0.03x2 = 40 + -40

Combine like terms: 40 + -40 = 0
-40 + -0.07x + 0.03x2 = 0

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

Divide each side by '0.03'.
-1333.333333 + -2.333333333x + x2 = 0

Move the constant term to the right:

Add '1333.333333' to each side of the equation.
-1333.333333 + -2.333333333x + 1333.333333 + x2 = 0 + 1333.333333

Reorder the terms:
-1333.333333 + 1333.333333 + -2.333333333x + x2 = 0 + 1333.333333

Combine like terms: -1333.333333 + 1333.333333 = 0.000000
0.000000 + -2.333333333x + x2 = 0 + 1333.333333
-2.333333333x + x2 = 0 + 1333.333333

Combine like terms: 0 + 1333.333333 = 1333.333333
-2.333333333x + x2 = 1333.333333

The x term is -2.333333333x.  Take half its coefficient (-1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
-2.333333333x + 1.361111112 + x2 = 1333.333333 + 1.361111112

Reorder the terms:
1.361111112 + -2.333333333x + x2 = 1333.333333 + 1.361111112

Combine like terms: 1333.333333 + 1.361111112 = 1334.694444112
1.361111112 + -2.333333333x + x2 = 1334.694444112

Factor a perfect square on the left side:
(x + -1.166666667)(x + -1.166666667) = 1334.694444112

Calculate the square root of the right side: 36.53347019

Break this problem into two subproblems by setting 
(x + -1.166666667) equal to 36.53347019 and -36.53347019.

Subproblem 1

x + -1.166666667 = 36.53347019 Simplifying x + -1.166666667 = 36.53347019 Reorder the terms: -1.166666667 + x = 36.53347019 Solving -1.166666667 + x = 36.53347019 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.166666667' to each side of the equation. -1.166666667 + 1.166666667 + x = 36.53347019 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + x = 36.53347019 + 1.166666667 x = 36.53347019 + 1.166666667 Combine like terms: 36.53347019 + 1.166666667 = 37.700136857 x = 37.700136857 Simplifying x = 37.700136857

Subproblem 2

x + -1.166666667 = -36.53347019 Simplifying x + -1.166666667 = -36.53347019 Reorder the terms: -1.166666667 + x = -36.53347019 Solving -1.166666667 + x = -36.53347019 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.166666667' to each side of the equation. -1.166666667 + 1.166666667 + x = -36.53347019 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + x = -36.53347019 + 1.166666667 x = -36.53347019 + 1.166666667 Combine like terms: -36.53347019 + 1.166666667 = -35.366803523 x = -35.366803523 Simplifying x = -35.366803523

Solution

The solution to the problem is based on the solutions from the subproblems. x = {37.700136857, -35.366803523}

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