(10x+9)(7x+1)=38

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Solution for (10x+9)(7x+1)=38 equation:


Simplifying
(10x + 9)(7x + 1) = 38

Reorder the terms:
(9 + 10x)(7x + 1) = 38

Reorder the terms:
(9 + 10x)(1 + 7x) = 38

Multiply (9 + 10x) * (1 + 7x)
(9(1 + 7x) + 10x * (1 + 7x)) = 38
((1 * 9 + 7x * 9) + 10x * (1 + 7x)) = 38
((9 + 63x) + 10x * (1 + 7x)) = 38
(9 + 63x + (1 * 10x + 7x * 10x)) = 38
(9 + 63x + (10x + 70x2)) = 38

Combine like terms: 63x + 10x = 73x
(9 + 73x + 70x2) = 38

Solving
9 + 73x + 70x2 = 38

Solving for variable 'x'.

Reorder the terms:
9 + -38 + 73x + 70x2 = 38 + -38

Combine like terms: 9 + -38 = -29
-29 + 73x + 70x2 = 38 + -38

Combine like terms: 38 + -38 = 0
-29 + 73x + 70x2 = 0

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

Divide each side by '70'.
-0.4142857143 + 1.042857143x + x2 = 0.0

Move the constant term to the right:

Add '0.4142857143' to each side of the equation.
-0.4142857143 + 1.042857143x + 0.4142857143 + x2 = 0.0 + 0.4142857143

Reorder the terms:
-0.4142857143 + 0.4142857143 + 1.042857143x + x2 = 0.0 + 0.4142857143

Combine like terms: -0.4142857143 + 0.4142857143 = 0.0000000000
0.0000000000 + 1.042857143x + x2 = 0.0 + 0.4142857143
1.042857143x + x2 = 0.0 + 0.4142857143

Combine like terms: 0.0 + 0.4142857143 = 0.4142857143
1.042857143x + x2 = 0.4142857143

The x term is 1.042857143x.  Take half its coefficient (0.5214285715).
Square it (0.2718877552) and add it to both sides.

Add '0.2718877552' to each side of the equation.
1.042857143x + 0.2718877552 + x2 = 0.4142857143 + 0.2718877552

Reorder the terms:
0.2718877552 + 1.042857143x + x2 = 0.4142857143 + 0.2718877552

Combine like terms: 0.4142857143 + 0.2718877552 = 0.6861734695
0.2718877552 + 1.042857143x + x2 = 0.6861734695

Factor a perfect square on the left side:
(x + 0.5214285715)(x + 0.5214285715) = 0.6861734695

Calculate the square root of the right side: 0.828355883

Break this problem into two subproblems by setting 
(x + 0.5214285715) equal to 0.828355883 and -0.828355883.

Subproblem 1

x + 0.5214285715 = 0.828355883 Simplifying x + 0.5214285715 = 0.828355883 Reorder the terms: 0.5214285715 + x = 0.828355883 Solving 0.5214285715 + x = 0.828355883 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5214285715' to each side of the equation. 0.5214285715 + -0.5214285715 + x = 0.828355883 + -0.5214285715 Combine like terms: 0.5214285715 + -0.5214285715 = 0.0000000000 0.0000000000 + x = 0.828355883 + -0.5214285715 x = 0.828355883 + -0.5214285715 Combine like terms: 0.828355883 + -0.5214285715 = 0.3069273115 x = 0.3069273115 Simplifying x = 0.3069273115

Subproblem 2

x + 0.5214285715 = -0.828355883 Simplifying x + 0.5214285715 = -0.828355883 Reorder the terms: 0.5214285715 + x = -0.828355883 Solving 0.5214285715 + x = -0.828355883 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5214285715' to each side of the equation. 0.5214285715 + -0.5214285715 + x = -0.828355883 + -0.5214285715 Combine like terms: 0.5214285715 + -0.5214285715 = 0.0000000000 0.0000000000 + x = -0.828355883 + -0.5214285715 x = -0.828355883 + -0.5214285715 Combine like terms: -0.828355883 + -0.5214285715 = -1.3497844545 x = -1.3497844545 Simplifying x = -1.3497844545

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3069273115, -1.3497844545}

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