7x^2-x-8=0

Simple and best practice solution for 7x^2-x-8=0 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^2-x-8=0 equation:


Simplifying
7x2 + -1x + -8 = 0

Reorder the terms:
-8 + -1x + 7x2 = 0

Solving
-8 + -1x + 7x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-1 + -1x)(8 + -7x) = 0

Subproblem 1

Set the factor '(-1 + -1x)' equal to zero and attempt to solve: Simplifying -1 + -1x = 0 Solving -1 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -1x = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -1x = 0 + 1 -1x = 0 + 1 Combine like terms: 0 + 1 = 1 -1x = 1 Divide each side by '-1'. x = -1 Simplifying x = -1

Subproblem 2

Set the factor '(8 + -7x)' equal to zero and attempt to solve: Simplifying 8 + -7x = 0 Solving 8 + -7x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -7x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -7x = 0 + -8 -7x = 0 + -8 Combine like terms: 0 + -8 = -8 -7x = -8 Divide each side by '-7'. x = 1.142857143 Simplifying x = 1.142857143

Solution

x = {-1, 1.142857143}

See similar equations:

| -5x+2y=9 | | 15a-12a+35a-28=0 | | 2z+5=3z+17 | | 40-4x=50-8x | | 9x^2-3x-2=0 | | 3y+45=10y+17 | | 8x+27=10x+9 | | x^2-5x-36=0 | | 5c+.80+6=60 | | 9(8)+5= | | x+22=3x | | 2s^2-2s-112= | | 5h+22=72 | | 19-2x=29 | | 16a^3+8a^2-15a= | | 70+x+2=80 | | -12x-24=64 | | 5x^2+x-6= | | 300=3*x^2 | | x^2+11x+30= | | -38x+40=-302 | | 7c^2+10c+3= | | 3x^2+21x-24=0 | | 4x+(5x+6)+2=-37 | | x^2+22x+40= | | 23x+18=-28 | | 22-3*(3-3x)=31 | | b^2-8b-20= | | 3x-(-5-3x)+15=20 | | 15x-12=78 | | 24x^2-10x+1= | | 8x+(-11-4x)+21=30 |

Equations solver categories