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

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


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

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

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

Multiply (-3 + 4x) * (7 + x)
5x = (-3(7 + x) + 4x * (7 + x))
5x = ((7 * -3 + x * -3) + 4x * (7 + x))
5x = ((-21 + -3x) + 4x * (7 + x))
5x = (-21 + -3x + (7 * 4x + x * 4x))
5x = (-21 + -3x + (28x + 4x2))

Combine like terms: -3x + 28x = 25x
5x = (-21 + 25x + 4x2)

Solving
5x = -21 + 25x + 4x2

Solving for variable 'x'.

Reorder the terms:
21 + 5x + -25x + -4x2 = -21 + 25x + 4x2 + 21 + -25x + -4x2

Combine like terms: 5x + -25x = -20x
21 + -20x + -4x2 = -21 + 25x + 4x2 + 21 + -25x + -4x2

Reorder the terms:
21 + -20x + -4x2 = -21 + 21 + 25x + -25x + 4x2 + -4x2

Combine like terms: -21 + 21 = 0
21 + -20x + -4x2 = 0 + 25x + -25x + 4x2 + -4x2
21 + -20x + -4x2 = 25x + -25x + 4x2 + -4x2

Combine like terms: 25x + -25x = 0
21 + -20x + -4x2 = 0 + 4x2 + -4x2
21 + -20x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
21 + -20x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-5.25 + 5x + x2 = 0

Move the constant term to the right:

Add '5.25' to each side of the equation.
-5.25 + 5x + 5.25 + x2 = 0 + 5.25

Reorder the terms:
-5.25 + 5.25 + 5x + x2 = 0 + 5.25

Combine like terms: -5.25 + 5.25 = 0.00
0.00 + 5x + x2 = 0 + 5.25
5x + x2 = 0 + 5.25

Combine like terms: 0 + 5.25 = 5.25
5x + x2 = 5.25

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 5.25 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 5.25 + 6.25

Combine like terms: 5.25 + 6.25 = 11.5
6.25 + 5x + x2 = 11.5

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 11.5

Calculate the square root of the right side: 3.391164992

Break this problem into two subproblems by setting 
(x + 2.5) equal to 3.391164992 and -3.391164992.

Subproblem 1

x + 2.5 = 3.391164992 Simplifying x + 2.5 = 3.391164992 Reorder the terms: 2.5 + x = 3.391164992 Solving 2.5 + x = 3.391164992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 3.391164992 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 3.391164992 + -2.5 x = 3.391164992 + -2.5 Combine like terms: 3.391164992 + -2.5 = 0.891164992 x = 0.891164992 Simplifying x = 0.891164992

Subproblem 2

x + 2.5 = -3.391164992 Simplifying x + 2.5 = -3.391164992 Reorder the terms: 2.5 + x = -3.391164992 Solving 2.5 + x = -3.391164992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -3.391164992 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -3.391164992 + -2.5 x = -3.391164992 + -2.5 Combine like terms: -3.391164992 + -2.5 = -5.891164992 x = -5.891164992 Simplifying x = -5.891164992

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.891164992, -5.891164992}

See similar equations:

| 1/14(m-2)=2/7(m+9)-1/7m | | 2/3(6j+9)=3j+7 | | 4/(x+3)=5/(3x-5) | | 4/7-3=-2 | | 4x-2=x+12 | | 1x+2y+3=0 | | -14x=-11x | | 2(7x-5)=92 | | 3r^2=2(r-7) | | b-8/3=b+7/2 | | 7y-8-3y+7=0 | | (5x+6)/10=(4x-8)/10 | | 2y+5*2=4-2 | | 7k-5=4 | | Ln(r-2)=7 | | 3x+9=7x-17 | | c/-3+5=7 | | 3x+3-23=-24 | | 5(13x+15)=80 | | 4x^3-20x^2=96x | | s+27=108 | | 3x^2-6=-153 | | (1/2)x+(1/3)= | | 6250=7385-67x | | 58-5*80/7 | | 1/2(10+12n)=1/3(15n+15) | | 9x-4y=47 | | 3200=1996+43x | | -5y-3=4y-13 | | -105/35=15/n | | 4(3-x)-3(x-2)=24 | | 5/p=6/13 |

Equations solver categories