Solution :
(a) (503)2 = (503)2 = (500 + 3)2 = (500)2 + 2.500.3 + (3)2 = 250000 + 3000 + 9 = 253009
(b) (8.7)2 – (1.3)2 = (87 + 1.3) (87 – 1.3) = 10 × 7.4 = 74
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Solution :
(a) (503)2
= (503)2 = (500 + 3)2
= (500)2 + 2.500.3 + (3)2
= 250000 + 3000 + 9
= 253009
(b) (8.7)2 – (1.3)2
= (87 + 1.3) (87 – 1.3)
= 10 × 7.4
= 74