Question

6. Multiply the following:
(i) (5a + 3b) (5a - 3b)
(ii) (5x + 3y) (4a + 5b)
(iii) (6a + 3b) (7a - 8b)
(iv) (4x + 5y) (6x - 5y)
7. If a*b = -a + b - (-2), then find the
value of 4*3.

8. 15-1-5) = | 101 |-14= ?
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Answer 1

Answer:

6,(1)Given that,

(5a+3b)(5a-3b)

as we know that (a+b)(a-b) =a2-b2

a=5a,b=3b

5a2-3b2

25a2-9b2