(x^2-0.4x)+(-0.3x+1)=100

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Solution for (x^2-0.4x)+(-0.3x+1)=100 equation:


Simplifying
(x2 + -0.4x) + (-0.3x + 1) = 100

Reorder the terms:
(-0.4x + x2) + (-0.3x + 1) = 100

Remove parenthesis around (-0.4x + x2)
-0.4x + x2 + (-0.3x + 1) = 100

Reorder the terms:
-0.4x + x2 + (1 + -0.3x) = 100

Remove parenthesis around (1 + -0.3x)
-0.4x + x2 + 1 + -0.3x = 100

Reorder the terms:
1 + -0.4x + -0.3x + x2 = 100

Combine like terms: -0.4x + -0.3x = -0.7x
1 + -0.7x + x2 = 100

Solving
1 + -0.7x + x2 = 100

Solving for variable 'x'.

Reorder the terms:
1 + -100 + -0.7x + x2 = 100 + -100

Combine like terms: 1 + -100 = -99
-99 + -0.7x + x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-99 + -0.7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '99' to each side of the equation.
-99 + -0.7x + 99 + x2 = 0 + 99

Reorder the terms:
-99 + 99 + -0.7x + x2 = 0 + 99

Combine like terms: -99 + 99 = 0
0 + -0.7x + x2 = 0 + 99
-0.7x + x2 = 0 + 99

Combine like terms: 0 + 99 = 99
-0.7x + x2 = 99

The x term is -0.7x.  Take half its coefficient (-0.35).
Square it (0.1225) and add it to both sides.

Add '0.1225' to each side of the equation.
-0.7x + 0.1225 + x2 = 99 + 0.1225

Reorder the terms:
0.1225 + -0.7x + x2 = 99 + 0.1225

Combine like terms: 99 + 0.1225 = 99.1225
0.1225 + -0.7x + x2 = 99.1225

Factor a perfect square on the left side:
(x + -0.35)(x + -0.35) = 99.1225

Calculate the square root of the right side: 9.956028325

Break this problem into two subproblems by setting 
(x + -0.35) equal to 9.956028325 and -9.956028325.

Subproblem 1

x + -0.35 = 9.956028325 Simplifying x + -0.35 = 9.956028325 Reorder the terms: -0.35 + x = 9.956028325 Solving -0.35 + x = 9.956028325 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + x = 9.956028325 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + x = 9.956028325 + 0.35 x = 9.956028325 + 0.35 Combine like terms: 9.956028325 + 0.35 = 10.306028325 x = 10.306028325 Simplifying x = 10.306028325

Subproblem 2

x + -0.35 = -9.956028325 Simplifying x + -0.35 = -9.956028325 Reorder the terms: -0.35 + x = -9.956028325 Solving -0.35 + x = -9.956028325 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + x = -9.956028325 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + x = -9.956028325 + 0.35 x = -9.956028325 + 0.35 Combine like terms: -9.956028325 + 0.35 = -9.606028325 x = -9.606028325 Simplifying x = -9.606028325

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.306028325, -9.606028325}

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