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+1 vote
6.5k views
in Mathematics by (15.0k points)

Multiply the binomials.

(i) (2.5l − 0.5m) and (2.5l + 0.5m) 

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

1 Answer

+1 vote
by (24.9k points)
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Best answer

(i) (2.5l − 0.5m) × (2.5l + 0.5m) 

= 2.5l × (2.5l + 0.5m) − 0.5m (2.5l + 0.5m)

= 6.25l2 + 1.25lm − 1.25lm − 0.25m2

= 6.25l2 − 0.25m2

(ii) (a + 3b) × (x + 5) 

= a × (x + 5) + 3b × (x + 5)

= ax + 5a + 3bx + 15b

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