Using a2 − b2 = (a + b) (a − b), find(i)1532 − 1472 (ii) 12.12

1.	Using a2 − b2 = (a + b) (a − b), find(i)1532 − 1472 (ii) 12.12 − 7.92
Answer» (i) 153² − 147² = (153 + 147) (153 − 147) = (300) (6) = 1800 (iv) 12.1² − 7.9² = (12.1 + 7.9) (12.1 − 7.9) = (20.0) (4.2) = 84

Using a2 − b2 = (a + b) (a − b), find(i)1532 − 1472 (ii) 12.12 − 7.92

Answer»

(i) 153² − 147² = (153 + 147) (153 − 147)

= (300) (6) = 1800

(iv) 12.1² − 7.9² = (12.1 + 7.9) (12.1 − 7.9) = (20.0) (4.2) = 84

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