x^2-3x-4=4

Simple and best practice solution for x^2-3x-4=4 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 x^2-3x-4=4 equation:


Simplifying
x2 + -3x + -4 = 4

Reorder the terms:
-4 + -3x + x2 = 4

Solving
-4 + -3x + x2 = 4

Solving for variable 'x'.

Reorder the terms:
-4 + -4 + -3x + x2 = 4 + -4

Combine like terms: -4 + -4 = -8
-8 + -3x + x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-8 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -3x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + -3x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -3x + x2 = 0 + 8
-3x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
-3x + x2 = 8

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 8 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 8 + 2.25

Combine like terms: 8 + 2.25 = 10.25
2.25 + -3x + x2 = 10.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(x + -1.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

x + -1.5 = 3.201562119 Simplifying x + -1.5 = 3.201562119 Reorder the terms: -1.5 + x = 3.201562119 Solving -1.5 + x = 3.201562119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 3.201562119 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 3.201562119 + 1.5 x = 3.201562119 + 1.5 Combine like terms: 3.201562119 + 1.5 = 4.701562119 x = 4.701562119 Simplifying x = 4.701562119

Subproblem 2

x + -1.5 = -3.201562119 Simplifying x + -1.5 = -3.201562119 Reorder the terms: -1.5 + x = -3.201562119 Solving -1.5 + x = -3.201562119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -3.201562119 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -3.201562119 + 1.5 x = -3.201562119 + 1.5 Combine like terms: -3.201562119 + 1.5 = -1.701562119 x = -1.701562119 Simplifying x = -1.701562119

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.701562119, -1.701562119}

See similar equations:

| 4x-7=2(2-3)-1 | | 4x-7=2(2-3) | | 3x+5-(2x+10)=3-4x-(-2x+9) | | 8x-4(x-5)=2(x-5)+5 | | g(x)=2x^3+14x^2+14x | | 4x+5y=64 | | 2(x-2)=2(x+9) | | 6y^5+3x^2=2y+11 | | 2x+y=555 | | 5y-9+y+36=7y+30-4y | | Sin(x+10)=4cos(x) | | 4+9(10t+7)= | | 9x2/9 | | x+x(.08)=37476.80 | | Iny=kt | | 4x^2-x-x^2=0 | | -3x+8(3x-7)=20+2x | | 7+5m-3=5m+10-3m | | G(x)=7x^5-3x^3+x-9 | | 5m-32=7(m+8) | | q/3-4 | | 6x-(2x+17)=19 | | 3t-8=5t-2 | | H(x)=7x^6-4x^2+3 | | x-4x=60 | | ((4^2)/ln4)-((4^-2)/ln4) | | 3x-1=w | | -12n+3=-11n-1 | | 10.4=-2.4+2x | | 30x=400-40 | | U=1/5kw | | x^2-10x+8=-1 |

Equations solver categories