21x^2-25x-4=0

Simple and best practice solution for 21x^2-25x-4=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 21x^2-25x-4=0 equation:


Simplifying
21x2 + -25x + -4 = 0

Reorder the terms:
-4 + -25x + 21x2 = 0

Solving
-4 + -25x + 21x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-1 + -7x)(4 + -3x) = 0

Subproblem 1

Set the factor '(-1 + -7x)' equal to zero and attempt to solve: Simplifying -1 + -7x = 0 Solving -1 + -7x = 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 + -7x = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -7x = 0 + 1 -7x = 0 + 1 Combine like terms: 0 + 1 = 1 -7x = 1 Divide each side by '-7'. x = -0.1428571429 Simplifying x = -0.1428571429

Subproblem 2

Set the factor '(4 + -3x)' equal to zero and attempt to solve: Simplifying 4 + -3x = 0 Solving 4 + -3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -3x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -3x = 0 + -4 -3x = 0 + -4 Combine like terms: 0 + -4 = -4 -3x = -4 Divide each side by '-3'. x = 1.333333333 Simplifying x = 1.333333333

Solution

x = {-0.1428571429, 1.333333333}

See similar equations:

| -128+2x=80-6x | | 0=2x^2+4x | | 30x=25y | | (3/2)*(x+3)=(4/5)*x-8 | | 0=6x^2+x-2 | | 3x+3y+6+9=15 | | -84-x=-9x+44 | | 0=x^2+4x+4 | | 0=x^2-6x+5 | | 11x-114=3x+126 | | 22=2-2x+6x-10 | | -6x-15=9-7x | | 9x-47=21+5x | | 6+x-5x=24 | | -x-20=-3x+36 | | -23-5x=-8+19 | | x+18+x+x-9=69 | | 15(y+4)=3(2y+5) | | -22-5x=-8x+19 | | -z^4-1=0 | | -7x-46=-12x+54 | | 3x+3y+15+9=15 | | -7x-46=-12x+53 | | 25x^2-81y^2=0 | | -129+9x=143-7x | | 3(x+y)+15+9=6 | | 9x-37=71 | | x+15+x+x-5=100 | | -4+2x=18 | | -4+8+2x=18 | | (n-2)*(n+4)=27 | | (n-2)x(n+4)=27 |

Equations solver categories