Question

1.(4y+5)(4y-5)
2. (13n^3+7)(13n^6-7)
ayudaaa​

Answer 1

1- (4y+5)(4y−5)

=(4y+5)(4y+−5)

=(4y)(4y)+(4y)(−5)+(5)(4y)+(5)(−5)

=16y2−20y+20y−25

=16y2−25

2-(13n3+7)(13n6−7)

=(13n3+7)(13n6+−7)

=(13n3)(13n6)+(13n3)(−7)+(7)(13n6)+(7)(−7)

=169n9−91n3+91n6−49

=169n9+91n6−91n3−49