2x^2=0.7x+0.3

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Solution for 2x^2=0.7x+0.3 equation:


Simplifying
2x2 = 0.7x + 0.3

Reorder the terms:
2x2 = 0.3 + 0.7x

Solving
2x2 = 0.3 + 0.7x

Solving for variable 'x'.

Reorder the terms:
-0.3 + -0.7x + 2x2 = 0.3 + 0.7x + -0.3 + -0.7x

Reorder the terms:
-0.3 + -0.7x + 2x2 = 0.3 + -0.3 + 0.7x + -0.7x

Combine like terms: 0.3 + -0.3 = 0.0
-0.3 + -0.7x + 2x2 = 0.0 + 0.7x + -0.7x
-0.3 + -0.7x + 2x2 = 0.7x + -0.7x

Combine like terms: 0.7x + -0.7x = 0.0
-0.3 + -0.7x + 2x2 = 0.0

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

Divide each side by '2'.
-0.15 + -0.35x + x2 = 0.0

Move the constant term to the right:

Add '0.15' to each side of the equation.
-0.15 + -0.35x + 0.15 + x2 = 0.0 + 0.15

Reorder the terms:
-0.15 + 0.15 + -0.35x + x2 = 0.0 + 0.15

Combine like terms: -0.15 + 0.15 = 0.00
0.00 + -0.35x + x2 = 0.0 + 0.15
-0.35x + x2 = 0.0 + 0.15

Combine like terms: 0.0 + 0.15 = 0.15
-0.35x + x2 = 0.15

The x term is -0.35x.  Take half its coefficient (-0.175).
Square it (0.030625) and add it to both sides.

Add '0.030625' to each side of the equation.
-0.35x + 0.030625 + x2 = 0.15 + 0.030625

Reorder the terms:
0.030625 + -0.35x + x2 = 0.15 + 0.030625

Combine like terms: 0.15 + 0.030625 = 0.180625
0.030625 + -0.35x + x2 = 0.180625

Factor a perfect square on the left side:
(x + -0.175)(x + -0.175) = 0.180625

Calculate the square root of the right side: 0.425

Break this problem into two subproblems by setting 
(x + -0.175) equal to 0.425 and -0.425.

Subproblem 1

x + -0.175 = 0.425 Simplifying x + -0.175 = 0.425 Reorder the terms: -0.175 + x = 0.425 Solving -0.175 + x = 0.425 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.175' to each side of the equation. -0.175 + 0.175 + x = 0.425 + 0.175 Combine like terms: -0.175 + 0.175 = 0.000 0.000 + x = 0.425 + 0.175 x = 0.425 + 0.175 Combine like terms: 0.425 + 0.175 = 0.6 x = 0.6 Simplifying x = 0.6

Subproblem 2

x + -0.175 = -0.425 Simplifying x + -0.175 = -0.425 Reorder the terms: -0.175 + x = -0.425 Solving -0.175 + x = -0.425 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.175' to each side of the equation. -0.175 + 0.175 + x = -0.425 + 0.175 Combine like terms: -0.175 + 0.175 = 0.000 0.000 + x = -0.425 + 0.175 x = -0.425 + 0.175 Combine like terms: -0.425 + 0.175 = -0.25 x = -0.25 Simplifying x = -0.25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.6, -0.25}

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