Question

(7x² + 4y²)(5x² - y²)

Answer 1

okay so step by step explanation,

first multiply 7
`x^(2)` with 5
`x^(2)` and -
`y^(2)`

35
`x^(4)`-7
`x^(2)`
`y^(2)`

then do the second one

20
`x^(2)`
`y^(2)`-4
`y^(4)`

take the sum of those,

35
`x^(4)`+13
`x^(2)`
`y^(2)`-4
`y^(4)`

good luck<3!