## Help1234321 2 years ago HELP!!!!!!!!!!!!!!! Simplify 4^21 ---- 4^7 1. 4^28 2. 4^21 3. 4^7 4. 4^3

1. Help1234321

@gaby6

2. Help1234321

@sue101

3. Help1234321

@sunlab2015 @surdawi @MicroBot @MATHGEOMETRY8 @Hollywood_chrissy

4. SheldonEinstein

Always remember that : $$\frac{a^b}{a^c} = a^{b-c}$$

5. SheldonEinstein

Hence, $\large{\frac{4^{21}}{4^7} = 4^{21-7} = 4^{14}}$

6. Help1234321

Which operation would you use on the exponents to simplify the expression 57 × 511? Addition Subtraction Multiplication Division

7. Help1234321

Which operation would you use on the exponents to simplify the expression 5^7 × 5^11? Addition Subtraction Multiplication Division

8. Miyuru

9. Help1234321

Simplify 15^4 ---- 15^5

10. Help1234321

@Miyuru

11. Help1234321

@SheldonEinstein

12. Miyuru

Do subtraction.. :)

13. Help1234321

Simplify 15^4 ---- 15^5

14. Help1234321

wouldnt it be 15^-9??? not a answer

15. Help1234321

its 15^-4 and 15^5

16. Miyuru

Do subtraction like this....$\frac{15^4}{15^5}=15^{4-5}=15^{-1}$

17. Miyuru

This answer is for the one you typed before..

18. gaby6

$15^{(4-5)}$

20. Miyuru

$\frac{15^{-4}}{15^5}=15^{-4-5}=15^{-9}$