3x(x-4)=5x-7

Simple and best practice solution for 3x(x-4)=5x-7 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 3x(x-4)=5x-7 equation:


Simplifying
3x(x + -4) = 5x + -7

Reorder the terms:
3x(-4 + x) = 5x + -7
(-4 * 3x + x * 3x) = 5x + -7
(-12x + 3x2) = 5x + -7

Reorder the terms:
-12x + 3x2 = -7 + 5x

Solving
-12x + 3x2 = -7 + 5x

Solving for variable 'x'.

Reorder the terms:
7 + -12x + -5x + 3x2 = -7 + 5x + 7 + -5x

Combine like terms: -12x + -5x = -17x
7 + -17x + 3x2 = -7 + 5x + 7 + -5x

Reorder the terms:
7 + -17x + 3x2 = -7 + 7 + 5x + -5x

Combine like terms: -7 + 7 = 0
7 + -17x + 3x2 = 0 + 5x + -5x
7 + -17x + 3x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
7 + -17x + 3x2 = 0

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

Divide each side by '3'.
2.333333333 + -5.666666667x + x2 = 0

Move the constant term to the right:

Add '-2.333333333' to each side of the equation.
2.333333333 + -5.666666667x + -2.333333333 + x2 = 0 + -2.333333333

Reorder the terms:
2.333333333 + -2.333333333 + -5.666666667x + x2 = 0 + -2.333333333

Combine like terms: 2.333333333 + -2.333333333 = 0.000000000
0.000000000 + -5.666666667x + x2 = 0 + -2.333333333
-5.666666667x + x2 = 0 + -2.333333333

Combine like terms: 0 + -2.333333333 = -2.333333333
-5.666666667x + x2 = -2.333333333

The x term is -5.666666667x.  Take half its coefficient (-2.833333334).
Square it (8.027777782) and add it to both sides.

Add '8.027777782' to each side of the equation.
-5.666666667x + 8.027777782 + x2 = -2.333333333 + 8.027777782

Reorder the terms:
8.027777782 + -5.666666667x + x2 = -2.333333333 + 8.027777782

Combine like terms: -2.333333333 + 8.027777782 = 5.694444449
8.027777782 + -5.666666667x + x2 = 5.694444449

Factor a perfect square on the left side:
(x + -2.833333334)(x + -2.833333334) = 5.694444449

Calculate the square root of the right side: 2.386303512

Break this problem into two subproblems by setting 
(x + -2.833333334) equal to 2.386303512 and -2.386303512.

Subproblem 1

x + -2.833333334 = 2.386303512 Simplifying x + -2.833333334 = 2.386303512 Reorder the terms: -2.833333334 + x = 2.386303512 Solving -2.833333334 + x = 2.386303512 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.833333334' to each side of the equation. -2.833333334 + 2.833333334 + x = 2.386303512 + 2.833333334 Combine like terms: -2.833333334 + 2.833333334 = 0.000000000 0.000000000 + x = 2.386303512 + 2.833333334 x = 2.386303512 + 2.833333334 Combine like terms: 2.386303512 + 2.833333334 = 5.219636846 x = 5.219636846 Simplifying x = 5.219636846

Subproblem 2

x + -2.833333334 = -2.386303512 Simplifying x + -2.833333334 = -2.386303512 Reorder the terms: -2.833333334 + x = -2.386303512 Solving -2.833333334 + x = -2.386303512 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.833333334' to each side of the equation. -2.833333334 + 2.833333334 + x = -2.386303512 + 2.833333334 Combine like terms: -2.833333334 + 2.833333334 = 0.000000000 0.000000000 + x = -2.386303512 + 2.833333334 x = -2.386303512 + 2.833333334 Combine like terms: -2.386303512 + 2.833333334 = 0.447029822 x = 0.447029822 Simplifying x = 0.447029822

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.219636846, 0.447029822}

See similar equations:

| 12*ln(x)-ln(x^10)=ln(x+30) | | 2t=2t+5 | | -3=5(x+4) | | 32*2= | | X+88=28 | | 12*ln(x)-10*ln(x)=ln(x+30) | | y=5x^2-40x-2 | | -3=2y+9 | | 2x-7x+3=x-5+8 | | (-7j)+3j= | | 10xn=40 | | 26v=1118 | | 77x^2+75x+50=0 | | y^2+13-3=13 | | X-6(x-1)=7(3-x) | | (3-4i)*(5+2i)= | | -2(y+2)+10-7y= | | y+8=-4x-3 | | 4x+1y=12 | | x(0.05)+x=103.95 | | 350=25x+100 | | 3cos^2x-8cosx-3=0 | | 2(4m-18)=184 | | 4+9+3-12=4y+2y | | 3(5h-2)+4h= | | (9-v)(5v+6)=0 | | 1270.444=6.28r^2+137.532r | | -6x+15=-x+5 | | 5y=9x-8 | | -21+x=x+22 | | e+4=7 | | 21+x=x+22 |

Equations solver categories