Q48 of 128 Page 224

Fill in the blanks to make the statements true:

672 – 372 = (67 – 37) × ……………. = ………… .

(67 + 37), 3120

672 – 372 is of the form a2 – b2. Comparing the two we get, a = 67 and b = 37.


We have a2 - b2 = (a + b)(a-b).


So, 672 – 372 = (67 + 37)(67-37)


= (104)(30)


= 104×30 = 3120


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