1. ## answer all this questions ?

1) Eliminate in 11x^-2+(11x)^-2
2)perform the indicated operation and simplify ..
a)3(x^2+y^2) –x (y+2x)+2y cx+3y
b)-5c4x^2(2x+2)-2(x^2-5-2x)
factor the expression
a)5x^2+25x+30
b)3x^2-3
c)a^3+27
b) bu^3 v^3+18u^2 v w^4 – 12 u^2 v^3

3) simplify ( _3m^3_____)
qn^6

4)solve by using factoring

1)z^2 -8z=0

2) x^-4x+4=0

3)x^3 - 100x=0

5) find all real roots by using quadratic formula .

1) p^2 - 7 p+3 =0

2) 2 -2 x+x^2 =0

3) 2x^2+4x=5

6) a sales person needs to caulcuate the cost of an item with sale tax of 8.25% write an qvation that repersents the total cost c of an item costing x dollars

7) express the indicated system in term of the remaing system .
s= p (1+rt) j r (solve for r)
s=p (1+rt) jt ( solve for t)

2. Originally Posted by coolforever

4)solve by using factoring

1)z^2 -8z=0
You must take out a common factor

$\displaystyle z^2 -8z=0$

$\displaystyle z(z -8)=0$

Then by the null factor law

$\displaystyle z=0,8$

Have you done any work on these problems yet or did you just post them?