(102)2 – (98)2 is equal to

(102)² – (98)² is equal to

(a) 200

(b) 400

(c) 600

(d) 800

Answer : (d) 800

Hint:

(102)² – (98)² = (102 + 98) (102 – 98) = 200 × 4 = 800

96 × 104 is equal to

(a) 9984

(b) 9974

(c) 9964

(d) None of these

Answer : (a) 9984

Hint:

96 × 104 = (100 – 4) (100 + 4) = 100² – 4² = 10000 – 16

= 9984

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