Question

Multiply.
(2x+y)(4x-5y)

Answer 1

Alright here's the breakdown:
take what are related (like 2x+4x) and add them up
do the same with y-(-5y)
and that should equal
your answer
6x+(-4y)
hope this helps!

Answer 2

Use FOIL method
8x2​​−10xy+4yx−5y​2​​

8x​2​​+(−10xy+4xy)−5y​2

Answer:8x​2​​−6xy−5y​2​​