Question

simplify : 2 ³√40+ 3 ³√625 - 4 ³√320. plz help

Answer 1

hey...
____

please see the attachment above...

____________________________

hope this will help you.

Answer 2

Hey there !!!!!

=2∛40+3∛625-4∛320-----Equation 1

We can write 

40=2*2*2*5=2³*5

∛40=∛(2³*5)= ∛2³*∛5=2∛5

625=25²=(5²)²

∛625=∛5⁴=5∛5

320=40*8=40*2³=4*2³*10=2²*2³*2*5=2⁶*5

∛320=∛2⁶*5=(2⁶)¹/₃*∛5=2²*∛5=4*∛5

So, ∛40 =2*∛5 ,∛625=5∛5 ,∛320=4∛5

Now substituting values of ∛40,∛625 and ∛320 in equation 1

2∛40+3∛625-4∛320 =  2*2∛5+3*5*∛5-4*4∛5
                                 
                                 =4∛5+15∛5-16∛5

                                =∛5(19-16) = 3∛5

Hope this helped you !!!