1) (5a-7)² 2) (4a + 9b) ² 3) (6a - 5b) ² 4) ( 8a² + 3)² 5) ( 7a² + 4a²) tolong pake Cara

1. (5a-7)(5a-7)
25a² -35a -35a +49
25a² -70a +49

2. (4a+9b)(4a+9b)
16a²+36ab+36ab +81
16a² +72ab +81

3. (6a-5b)(6a-5b)
36a² -30ab -30ab +25
36a² -60ab +25

4. (8a²+3)(8a²+3)
64a⁴+24a²+24a² +9
64a⁴ +48a² +9

5. (7a²+4a²) = 11a²