xxImHisGirlxx 2 years ago help !

1. xxImHisGirlxx

What is the simplified form of each expression? 7x^-8 times 6x^3 42 over x^5 1 over 42x^5 42x^11 13x^-5 (-2x^8) times 3y^9 times 2x^4 3x^12y^9 -12x^72y^9 -12xy^21 -12x^12y^9

2. anonymous

a negative exponential means it is actually 1/ the exponential $7*\frac{ 1 }{ x ^{8} } * 6 * x ^{3} = 42 * \frac{ x^{3} }{ x^{8} }$

3. xxImHisGirlxx

i think c? for 1 and d for 2

4. anonymous

a) is 42 x ^5 ?

5. anonymous

it is not c because one of the x exponents has a negative sign the other has a positive

6. xxImHisGirlxx

so its a ?

7. anonymous

yes, I believe it should be a)

8. xxImHisGirlxx

and number 2?

9. anonymous

$42 * \frac{ x^{3} }{ x^{8} }$ you can cancel the three X above and are left with 42 over x^5

10. xxImHisGirlxx

@thomaster

11. anonymous

$(-2x^8) \times 3y^9 \times 2x^4 = -4 x^{12} \times 3 y^9=-12 x^{12}y^9$ yes, d) for second one