Question

1. (8-5x)(9-5x)
2. (2a-5)(2a-9)
3. (15+6p)(8-4p)
4. (6p-9q(6p+9q)
5. (8p+4q)(6p+7q) . bagaimana caranya , tolong yaaa

Answer 1

1. (8-5x)(9-5x)
= 72 - 40x - 45x + 25x^2
= 25x^2 - 85x - 72

2. (2a-5)(2a-9)
= 4a^2 - 18a - 10a + 45
= 4a^2 -28a + 45

3. (15+6p)(8-4p)
= 120 - 60p + 48p - 24p^2
= -24p^2 - 12p + 120
= 24p^2 + 12p - 120
= 2p^2 + p - 10

4. (6p-9q)(6p+9q)
= 36p^2 + 54pq - 54pq - 81q^2
= 36p^2 - 81q^2
= 4p^2 - 9q^2

5. (8p+ 4q)(6p + 7q)
= 48p^2 + 56pq + 24pq + 28q^2
= 48p^2 + 80pq + 28q^2
= 12p^2 + 20pq + 7q^2