1)1) (5b+4a)(4a-5b) = 20a^2 - 25b^2 - 20ab + 25ab = 20a^2 - 25b^2 - 20ab + 25ab2) (5x+6y)(6y-5x) = 30y^2 - 25x^2 - 30xy + 25xy = 30y^2 - 25x^2 - 30xy + 25xy3) (2p+7q)(7q-2p) = 14q^2 - 4p^2 - 14pq + 4pq = 14q^2 - 4p^2 - 14pq + 4pq
2)1) -81x^2+16y^2 = -(9x+4y)(9x-4y)2) 36p^2-25q^2 = (6p+5q)(6p-5q)3) 4a^2b^2-1 = (2ab+1)(2ab-1)
1)
1) (5b+4a)(4a-5b) = 20a^2 - 25b^2 - 20ab + 25ab = 20a^2 - 25b^2 - 20ab + 25ab
2) (5x+6y)(6y-5x) = 30y^2 - 25x^2 - 30xy + 25xy = 30y^2 - 25x^2 - 30xy + 25xy
3) (2p+7q)(7q-2p) = 14q^2 - 4p^2 - 14pq + 4pq = 14q^2 - 4p^2 - 14pq + 4pq
2)
1) -81x^2+16y^2 = -(9x+4y)(9x-4y)
2) 36p^2-25q^2 = (6p+5q)(6p-5q)
3) 4a^2b^2-1 = (2ab+1)(2ab-1)