Q16 of 50 Page 9

Simplify the following using the formula: (a-b)(a+b)=a2 -b2

(i) (82)2 -(18)2


(ii) (467)2 -(33)2


(i) (82)2 -(18)2


Using formula:


(a – b) (a + b) = a2 – b2, we get


= (82 – 18) (82 + 18)


= 64 × 100


= 6400


(ii) (467)2 -(33)2


Using formula:


(a – b) (a + b) = a2 – b2, we get


= (467 – 33) (467 + 33)


= (434) (500)


= 217000


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