If it's not what You are looking for type in the equation solver your own equation and let us solve it.
f(5)=-5^2+6(5)-4
We move all terms to the left:
f(5)-(-5^2+6(5)-4)=0
We add all the numbers together, and all the variables
f^5-36=0
We do not support efpression: f^5
| 5x,x=50 | | -3a=12-5a | | -8+10x=19+9x | | b+3.2=5.7 | | 9x-11=6x+11 | | y+y=y^2 | | 6+4x=2x-18 | | –2x–3=13 | | x/2x+5=17 | | 13+v=25 | | 6x+10-5x+28=180 | | –2=4−–2y | | –9+3j=3j | | F(3)=-2x+15 | | 3b−47=−3b+7 | | f(-5)=2(-5^2)+4(-5)-9 | | –c+c=0 | | g/3− 2=2 | | y+17/2=y | | 12x8=2x+18 | | 2x+7x+4=x-20 | | 8v+2=-70 | | 7s=4s+3s | | 15x-7=6x-34 | | 16-4x=4x | | 4^(x+5)=7^x | | 23-(5x-3)=3(5x-20 | | 1/4-2+3x=3/2x+3+3/2x | | 5(p–5)=15 | | 2(p-48)=p | | 6x-5+x+25=180 | | -134-6x=40-12x |