21x^2-36x+15=0

Simple and best practice solution for 21x^2-36x+15=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^2-36x+15=0 equation:


Simplifying
21x2 + -36x + 15 = 0

Reorder the terms:
15 + -36x + 21x2 = 0

Solving
15 + -36x + 21x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(5 + -12x + 7x2) = 0

Factor a trinomial.
3((5 + -7x)(1 + -1x)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(5 + -7x)' equal to zero and attempt to solve: Simplifying 5 + -7x = 0 Solving 5 + -7x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -7x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -7x = 0 + -5 -7x = 0 + -5 Combine like terms: 0 + -5 = -5 -7x = -5 Divide each side by '-7'. x = 0.7142857143 Simplifying x = 0.7142857143

Subproblem 2

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

Solution

x = {0.7142857143, 1}

See similar equations:

| 3x+8=40 | | 4x-8=29 | | 8x+1=12x+3 | | 3-2[5-(6y-2)]= | | x+20+4x=-20-4x-23 | | 5y=50 | | 4x+3-8x=24 | | N=0.05x-98.65 | | (m+2)(-3)=5 | | -16x-20=13x+70 | | -9c+7=-11 | | 8g=96 | | 3-2(6y-2)= | | 4(2c-1)-4=6c+6 | | 4x-3=10-2x | | 145x+22=64x-81 | | -2y^2-y+21=0 | | 1/5=x+3/10 | | m+2/3=5 | | v-.87=2.5 | | -7(x+2)-10=35+4 | | 2x+6=67 | | 2d+1=11 | | 3x+2x=32 | | 90+2t+(t+10.5)=180 | | 5y+10-5y-2=2y-4 | | x-9=-5+7 | | -8y-10=9y+24 | | 25=z/-4 | | 11x=11x+4 | | 1/5(6y-4)+1/15(12y+16) | | 6x^2-11x-3x=0 |

Equations solver categories