1.

Multiply: (a + 3b) and (x + 5)

Answer»

(a + 3b) and (x + 5)

= a (x + 5) + 3b (x + 5)

= a × x + a × 5 + 3b × x + 3b × 5

= ax + 5a + 3bx + 3 × 5 × b

= ax + 5a + 3 bx + 15 b



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