Need help with factoring and solving polynomials PLEASE?

Question

I need to get answears to these math problems and i'm really stuck. So any help would be appreciated.

1) x4 + 10x2 + 16

2) 8x3 - 12x2 - 2x + 3

3) x4 + 10x2 + 16

4) x3 - 3x2 = 0

5) x3 + 27 = 0

6) x3 + 8x2 = -16x

7)125x3 - 8

8) x4 + 7x3 - 8x - 56 = 0

Answer 1

I'm thinking you should learn to do a little math. None of these are very hard, so give yourself a kick in the butt and learn how to do them. 'Cause if you don't learn now, one day you will be back taking Adult Continuing Ed, and wishing you had learned this stuff in high school.

How do I know? I tutored HUNDREDS of students in Adult Ed. who regretted not learning this in school.

Answer 2

#5and 7
the formula for factoring perfect cubes is:

a^3 + b^3 = (a + b) (a^2 - ab + b^2)

If the prfect cube is a subtraction then the first parenthese has - and the second is + + (the last term is always +)

#2 and 8

factor by grouping since there are four terms

you must be in alg 2 to have perfect cubes so when you first learned factoring,
1 set it = to zero
2 look for common factors and pull them out first
3 the last term needs to be two # multiplied that add up to the middle therm
If the last term is positive both numbers will have the same sign. If the last term is negative there will be one positive and one negative, so the #s will subtract to the middle term since - # means add the opposite.

if you don't understand it now, get someone to help you learn to factor, in math it is one of the most important things and it will always keep coming back.