10x^2-7=4x

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Solution for 10x^2-7=4x equation:


Simplifying
10x2 + -7 = 4x

Reorder the terms:
-7 + 10x2 = 4x

Solving
-7 + 10x2 = 4x

Solving for variable 'x'.

Reorder the terms:
-7 + -4x + 10x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-7 + -4x + 10x2 = 0

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

Divide each side by '10'.
-0.7 + -0.4x + x2 = 0

Move the constant term to the right:

Add '0.7' to each side of the equation.
-0.7 + -0.4x + 0.7 + x2 = 0 + 0.7

Reorder the terms:
-0.7 + 0.7 + -0.4x + x2 = 0 + 0.7

Combine like terms: -0.7 + 0.7 = 0.0
0.0 + -0.4x + x2 = 0 + 0.7
-0.4x + x2 = 0 + 0.7

Combine like terms: 0 + 0.7 = 0.7
-0.4x + x2 = 0.7

The x term is -0.4x.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4x + 0.04 + x2 = 0.7 + 0.04

Reorder the terms:
0.04 + -0.4x + x2 = 0.7 + 0.04

Combine like terms: 0.7 + 0.04 = 0.74
0.04 + -0.4x + x2 = 0.74

Factor a perfect square on the left side:
(x + -0.2)(x + -0.2) = 0.74

Calculate the square root of the right side: 0.860232527

Break this problem into two subproblems by setting 
(x + -0.2) equal to 0.860232527 and -0.860232527.

Subproblem 1

x + -0.2 = 0.860232527 Simplifying x + -0.2 = 0.860232527 Reorder the terms: -0.2 + x = 0.860232527 Solving -0.2 + x = 0.860232527 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = 0.860232527 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = 0.860232527 + 0.2 x = 0.860232527 + 0.2 Combine like terms: 0.860232527 + 0.2 = 1.060232527 x = 1.060232527 Simplifying x = 1.060232527

Subproblem 2

x + -0.2 = -0.860232527 Simplifying x + -0.2 = -0.860232527 Reorder the terms: -0.2 + x = -0.860232527 Solving -0.2 + x = -0.860232527 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = -0.860232527 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = -0.860232527 + 0.2 x = -0.860232527 + 0.2 Combine like terms: -0.860232527 + 0.2 = -0.660232527 x = -0.660232527 Simplifying x = -0.660232527

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.060232527, -0.660232527}

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