(7x-3)(7x-3)=7

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Solution for (7x-3)(7x-3)=7 equation:


Simplifying
(7x + -3)(7x + -3) = 7

Reorder the terms:
(-3 + 7x)(7x + -3) = 7

Reorder the terms:
(-3 + 7x)(-3 + 7x) = 7

Multiply (-3 + 7x) * (-3 + 7x)
(-3(-3 + 7x) + 7x * (-3 + 7x)) = 7
((-3 * -3 + 7x * -3) + 7x * (-3 + 7x)) = 7
((9 + -21x) + 7x * (-3 + 7x)) = 7
(9 + -21x + (-3 * 7x + 7x * 7x)) = 7
(9 + -21x + (-21x + 49x2)) = 7

Combine like terms: -21x + -21x = -42x
(9 + -42x + 49x2) = 7

Solving
9 + -42x + 49x2 = 7

Solving for variable 'x'.

Reorder the terms:
9 + -7 + -42x + 49x2 = 7 + -7

Combine like terms: 9 + -7 = 2
2 + -42x + 49x2 = 7 + -7

Combine like terms: 7 + -7 = 0
2 + -42x + 49x2 = 0

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

Divide each side by '49'.
0.04081632653 + -0.8571428571x + x2 = 0

Move the constant term to the right:

Add '-0.04081632653' to each side of the equation.
0.04081632653 + -0.8571428571x + -0.04081632653 + x2 = 0 + -0.04081632653

Reorder the terms:
0.04081632653 + -0.04081632653 + -0.8571428571x + x2 = 0 + -0.04081632653

Combine like terms: 0.04081632653 + -0.04081632653 = 0.00000000000
0.00000000000 + -0.8571428571x + x2 = 0 + -0.04081632653
-0.8571428571x + x2 = 0 + -0.04081632653

Combine like terms: 0 + -0.04081632653 = -0.04081632653
-0.8571428571x + x2 = -0.04081632653

The x term is -0.8571428571x.  Take half its coefficient (-0.4285714286).
Square it (0.1836734694) and add it to both sides.

Add '0.1836734694' to each side of the equation.
-0.8571428571x + 0.1836734694 + x2 = -0.04081632653 + 0.1836734694

Reorder the terms:
0.1836734694 + -0.8571428571x + x2 = -0.04081632653 + 0.1836734694

Combine like terms: -0.04081632653 + 0.1836734694 = 0.14285714287
0.1836734694 + -0.8571428571x + x2 = 0.14285714287

Factor a perfect square on the left side:
(x + -0.4285714286)(x + -0.4285714286) = 0.14285714287

Calculate the square root of the right side: 0.377964473

Break this problem into two subproblems by setting 
(x + -0.4285714286) equal to 0.377964473 and -0.377964473.

Subproblem 1

x + -0.4285714286 = 0.377964473 Simplifying x + -0.4285714286 = 0.377964473 Reorder the terms: -0.4285714286 + x = 0.377964473 Solving -0.4285714286 + x = 0.377964473 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4285714286' to each side of the equation. -0.4285714286 + 0.4285714286 + x = 0.377964473 + 0.4285714286 Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000 0.0000000000 + x = 0.377964473 + 0.4285714286 x = 0.377964473 + 0.4285714286 Combine like terms: 0.377964473 + 0.4285714286 = 0.8065359016 x = 0.8065359016 Simplifying x = 0.8065359016

Subproblem 2

x + -0.4285714286 = -0.377964473 Simplifying x + -0.4285714286 = -0.377964473 Reorder the terms: -0.4285714286 + x = -0.377964473 Solving -0.4285714286 + x = -0.377964473 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4285714286' to each side of the equation. -0.4285714286 + 0.4285714286 + x = -0.377964473 + 0.4285714286 Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000 0.0000000000 + x = -0.377964473 + 0.4285714286 x = -0.377964473 + 0.4285714286 Combine like terms: -0.377964473 + 0.4285714286 = 0.0506069556 x = 0.0506069556 Simplifying x = 0.0506069556

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8065359016, 0.0506069556}

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