(7x-1)(x+6)=8

Simple and best practice solution for (7x-1)(x+6)=8 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for (7x-1)(x+6)=8 equation:


Simplifying
(7x + -1)(x + 6) = 8

Reorder the terms:
(-1 + 7x)(x + 6) = 8

Reorder the terms:
(-1 + 7x)(6 + x) = 8

Multiply (-1 + 7x) * (6 + x)
(-1(6 + x) + 7x * (6 + x)) = 8
((6 * -1 + x * -1) + 7x * (6 + x)) = 8
((-6 + -1x) + 7x * (6 + x)) = 8
(-6 + -1x + (6 * 7x + x * 7x)) = 8
(-6 + -1x + (42x + 7x2)) = 8

Combine like terms: -1x + 42x = 41x
(-6 + 41x + 7x2) = 8

Solving
-6 + 41x + 7x2 = 8

Solving for variable 'x'.

Reorder the terms:
-6 + -8 + 41x + 7x2 = 8 + -8

Combine like terms: -6 + -8 = -14
-14 + 41x + 7x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-14 + 41x + 7x2 = 0

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

Divide each side by '7'.
-2 + 5.857142857x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 5.857142857x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 5.857142857x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 5.857142857x + x2 = 0 + 2
5.857142857x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
5.857142857x + x2 = 2

The x term is 5.857142857x.  Take half its coefficient (2.928571429).
Square it (8.576530615) and add it to both sides.

Add '8.576530615' to each side of the equation.
5.857142857x + 8.576530615 + x2 = 2 + 8.576530615

Reorder the terms:
8.576530615 + 5.857142857x + x2 = 2 + 8.576530615

Combine like terms: 2 + 8.576530615 = 10.576530615
8.576530615 + 5.857142857x + x2 = 10.576530615

Factor a perfect square on the left side:
(x + 2.928571429)(x + 2.928571429) = 10.576530615

Calculate the square root of the right side: 3.25215784

Break this problem into two subproblems by setting 
(x + 2.928571429) equal to 3.25215784 and -3.25215784.

Subproblem 1

x + 2.928571429 = 3.25215784 Simplifying x + 2.928571429 = 3.25215784 Reorder the terms: 2.928571429 + x = 3.25215784 Solving 2.928571429 + x = 3.25215784 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.928571429' to each side of the equation. 2.928571429 + -2.928571429 + x = 3.25215784 + -2.928571429 Combine like terms: 2.928571429 + -2.928571429 = 0.000000000 0.000000000 + x = 3.25215784 + -2.928571429 x = 3.25215784 + -2.928571429 Combine like terms: 3.25215784 + -2.928571429 = 0.323586411 x = 0.323586411 Simplifying x = 0.323586411

Subproblem 2

x + 2.928571429 = -3.25215784 Simplifying x + 2.928571429 = -3.25215784 Reorder the terms: 2.928571429 + x = -3.25215784 Solving 2.928571429 + x = -3.25215784 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.928571429' to each side of the equation. 2.928571429 + -2.928571429 + x = -3.25215784 + -2.928571429 Combine like terms: 2.928571429 + -2.928571429 = 0.000000000 0.000000000 + x = -3.25215784 + -2.928571429 x = -3.25215784 + -2.928571429 Combine like terms: -3.25215784 + -2.928571429 = -6.180729269 x = -6.180729269 Simplifying x = -6.180729269

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.323586411, -6.180729269}

See similar equations:

| 23/4+24/4= | | -4x+6+3(x+1)=4x-7 | | 80+2x+4=9x | | -7x+2+3x-9=1 | | 13x-4=2x+51 | | 29+2x+3=10x | | x^2+5x^2=6x | | 12x+10y=15 | | s^2+12s+36=0 | | 7.58=6.28(r) | | -12x=x^2+36 | | 4x-13=2y | | 2x^2-28x-30=0 | | 5x^2-2=33 | | x(x+1)=29-x+(x+1) | | 4x+(6*5)=50 | | y=4+4x+x^2 | | 4x+(6+5)=50 | | 23d^2-100=0 | | 4x-3=x+8 | | 6x+6+7(x+1)=6x+3 | | x(x+1)+29=x+(x+1) | | x^3-2x^2-8=0 | | 2x+123=-78-7x | | x(x+1)=306 | | 26=6+37t-16t^2 | | -24=3b-9 | | 32x(x+2)=11520 | | 9x+6x=60 | | -68x+40+12x^2=0 | | 0.06*w=3.1 | | 8(t-2)+4t=4(3t+3)-9 |

Equations solver categories