6(1-3x)+7x(7-x)=

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Solution for 6(1-3x)+7x(7-x)= equation:


Simplifying
6(1 + -3x) + 7x(7 + -1x) = 0
(1 * 6 + -3x * 6) + 7x(7 + -1x) = 0
(6 + -18x) + 7x(7 + -1x) = 0
6 + -18x + (7 * 7x + -1x * 7x) = 0
6 + -18x + (49x + -7x2) = 0

Combine like terms: -18x + 49x = 31x
6 + 31x + -7x2 = 0

Solving
6 + 31x + -7x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
-0.8571428571 + -4.428571429x + x2 = 0

Move the constant term to the right:

Add '0.8571428571' to each side of the equation.
-0.8571428571 + -4.428571429x + 0.8571428571 + x2 = 0 + 0.8571428571

Reorder the terms:
-0.8571428571 + 0.8571428571 + -4.428571429x + x2 = 0 + 0.8571428571

Combine like terms: -0.8571428571 + 0.8571428571 = 0.0000000000
0.0000000000 + -4.428571429x + x2 = 0 + 0.8571428571
-4.428571429x + x2 = 0 + 0.8571428571

Combine like terms: 0 + 0.8571428571 = 0.8571428571
-4.428571429x + x2 = 0.8571428571

The x term is -4.428571429x.  Take half its coefficient (-2.214285715).
Square it (4.903061228) and add it to both sides.

Add '4.903061228' to each side of the equation.
-4.428571429x + 4.903061228 + x2 = 0.8571428571 + 4.903061228

Reorder the terms:
4.903061228 + -4.428571429x + x2 = 0.8571428571 + 4.903061228

Combine like terms: 0.8571428571 + 4.903061228 = 5.7602040851
4.903061228 + -4.428571429x + x2 = 5.7602040851

Factor a perfect square on the left side:
(x + -2.214285715)(x + -2.214285715) = 5.7602040851

Calculate the square root of the right side: 2.400042517

Break this problem into two subproblems by setting 
(x + -2.214285715) equal to 2.400042517 and -2.400042517.

Subproblem 1

x + -2.214285715 = 2.400042517 Simplifying x + -2.214285715 = 2.400042517 Reorder the terms: -2.214285715 + x = 2.400042517 Solving -2.214285715 + x = 2.400042517 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.214285715' to each side of the equation. -2.214285715 + 2.214285715 + x = 2.400042517 + 2.214285715 Combine like terms: -2.214285715 + 2.214285715 = 0.000000000 0.000000000 + x = 2.400042517 + 2.214285715 x = 2.400042517 + 2.214285715 Combine like terms: 2.400042517 + 2.214285715 = 4.614328232 x = 4.614328232 Simplifying x = 4.614328232

Subproblem 2

x + -2.214285715 = -2.400042517 Simplifying x + -2.214285715 = -2.400042517 Reorder the terms: -2.214285715 + x = -2.400042517 Solving -2.214285715 + x = -2.400042517 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.214285715' to each side of the equation. -2.214285715 + 2.214285715 + x = -2.400042517 + 2.214285715 Combine like terms: -2.214285715 + 2.214285715 = 0.000000000 0.000000000 + x = -2.400042517 + 2.214285715 x = -2.400042517 + 2.214285715 Combine like terms: -2.400042517 + 2.214285715 = -0.185756802 x = -0.185756802 Simplifying x = -0.185756802

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.614328232, -0.185756802}

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