If it's not what You are looking for type in the equation solver your own equation and let us solve it.
Simplifying
21r2 + -90 + 24 = 0
Reorder the terms:
-90 + 24 + 21r2 = 0
Combine like terms: -90 + 24 = -66
-66 + 21r2 = 0
Solving
-66 + 21r2 = 0
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '66' to each side of the equation.
-66 + 66 + 21r2 = 0 + 66
Combine like terms: -66 + 66 = 0
0 + 21r2 = 0 + 66
21r2 = 0 + 66
Combine like terms: 0 + 66 = 66
21r2 = 66
Divide each side by '21'.
r2 = 3.142857143
Simplifying
r2 = 3.142857143
Take the square root of each side:
r = {-1.772810521, 1.772810521}
| 4x^4-4x^3-7x^2-4x+4x=0 | | (3i)/(5-4i) | | 30w^3+76w^2+14w=0 | | 4k^2+15k+9=0 | | x+8+x+8+x=180 | | 4r^2+9=0 | | 8m+5=4m-15 | | log[9](7)-log[9](10)=log[9]x | | x^2+-6x+8y+17=0 | | y=14.95+.50(50) | | 9-4(2c-1)= | | 3(-4b)-2(a-b-c)= | | 5q-4=2q+2 | | k=4-k | | -m(2m+2n)+3mn+2m^2= | | 20x+0.50=100x+0.25 | | 8n-2(n^2+n)+12= | | 20x+0.25=100 | | Cos(2t)=sin(t) | | 6x7/5 | | (2y-3)(2y-3)(2y-3)= | | 2.5x+3.75=5x | | =-3.8-1.2 | | 3(-2-2)-1=2-5(-2+5) | | =3.8-1.2 | | f(x)=(x)2+6x+9 | | -3x+15=4.5 | | =(4x+18y)-(-22x+6y) | | 14x+18=275-222 | | x^3+4x-166=0 | | =(3x+16y)-(-23x+5y) | | 4(2+0y)-3y=24 |