Q. 23.7( 14 Votes )

Find each of the

Answer :

(4a + 5b) x (5a - 6b)


= 4a (5a - 6b) + 5b (5a - 6b)


= 20a2 - 24ab + 25ab - 30b2


= 20a2 + ab - 30b2


(ii) (6x2 - x + 8) × (x2 - 3)


(6x2 - x + 8) × (x2 - 3)


= x2 (6x2 - x + 8) - 3 (6x2 - x + 8)


= 6x4 - x3 + 8x2 - 18 x2 + 3x – 24


6x4 - x3 – 10x2 + 3x - 24


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