2=-0.05x^2+0.7x

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Solution for 2=-0.05x^2+0.7x equation:


Simplifying
2 = -0.05x2 + 0.7x

Reorder the terms:
2 = 0.7x + -0.05x2

Solving
2 = 0.7x + -0.05x2

Solving for variable 'x'.

Reorder the terms:
2 + -0.7x + 0.05x2 = 0.7x + -0.7x + -0.05x2 + 0.05x2

Combine like terms: 0.7x + -0.7x = 0.0
2 + -0.7x + 0.05x2 = 0.0 + -0.05x2 + 0.05x2
2 + -0.7x + 0.05x2 = -0.05x2 + 0.05x2

Combine like terms: -0.05x2 + 0.05x2 = 0.00
2 + -0.7x + 0.05x2 = 0.00

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

Divide each side by '0.05'.
40 + -14x + x2 = 0

Move the constant term to the right:

Add '-40' to each side of the equation.
40 + -14x + -40 + x2 = 0 + -40

Reorder the terms:
40 + -40 + -14x + x2 = 0 + -40

Combine like terms: 40 + -40 = 0
0 + -14x + x2 = 0 + -40
-14x + x2 = 0 + -40

Combine like terms: 0 + -40 = -40
-14x + x2 = -40

The x term is -14x.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14x + 49 + x2 = -40 + 49

Reorder the terms:
49 + -14x + x2 = -40 + 49

Combine like terms: -40 + 49 = 9
49 + -14x + x2 = 9

Factor a perfect square on the left side:
(x + -7)(x + -7) = 9

Calculate the square root of the right side: 3

Break this problem into two subproblems by setting 
(x + -7) equal to 3 and -3.

Subproblem 1

x + -7 = 3 Simplifying x + -7 = 3 Reorder the terms: -7 + x = 3 Solving -7 + x = 3 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = 3 + 7 Combine like terms: -7 + 7 = 0 0 + x = 3 + 7 x = 3 + 7 Combine like terms: 3 + 7 = 10 x = 10 Simplifying x = 10

Subproblem 2

x + -7 = -3 Simplifying x + -7 = -3 Reorder the terms: -7 + x = -3 Solving -7 + x = -3 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = -3 + 7 Combine like terms: -7 + 7 = 0 0 + x = -3 + 7 x = -3 + 7 Combine like terms: -3 + 7 = 4 x = 4 Simplifying x = 4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10, 4}

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