Tick (✓) the correct answer:

Question:

Tick (✓) the correct answer:

(82)2 − (18)2 = ?

(a) 8218

(b) 6418

(c) 6400

(d) 7204

Solution:

(c) 6400

$(82)^{2}-(18)^{2}$       [using the identity (a-b)(a+b)=a2 -b2]

$=(82+18)(82-18)$

$=(100)(64)$

$=6400$

 

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