Question

(i) (5a + 3b) (5a - 3b)
(ii) (5x + 3y) (4a + 5b)
(iii)(6a + 3b) (7a - 8b)
(iv) (4x + 5y) (6x - 5y)​

Answer 1

Step-by-step explanation:

( 1 ) (5a + 3b)(5a - 3b)

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

25a - 15ab + 15ab - 15b²

25a - 30ab - 15b²

( 2 ) (5x + 3y)(4a + 5b)

5x(4a + 5b) + 3y(4a +5b)

20ax + 25bx + 12ay + 15by

( 3 ) (6a + 3b)(7a -8b)

6a(7a - 8b) + 3b(7a - 8b)

42a² - 48ab + 21ab - 24b²

42a² - 69ab - 24b²

( 4 ) (4x + 5y)(6x - 5y)

4x(6x - 5y) + 5y(6x - 5y)

24x² - 20xy + 30xy - 25y²

24x² - 50xy - 25y²

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