This gives us 81x^8
d) Divide everything by two. This gives us (4x -3(x+2) +10)/4 Next we add and subtract... (x + 4)/4 And that's it
10 a) This becomes x^2 + 4x = 21 which becomes x^2 +4x -21 = 0
Now we use the quadratic equation. Look it up if you don't know it.
(-4 plus or minus the square root of four squared plus 84) divided by two
The radical comes out to square root of 100, which is ten, so we have -4 plus or minus 10 divided by two. Factor out the two and you get -2 plus or minus 5, which gives us 3 and -7.
10b) multiply the first fraction by 2/2 and the second by 3/3. This gives us 2x-2 - 3x -3 = -1x -5 = 6. Add five to each side, -1x = 11. Now divide by -1. x = -11.
11. You've got a good start but I don't feel like graphing it
Honestly dude, I would go to the library or bookstore and get you a nice book with all this stuff. Looks like you need a real refresher.