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Find the value using suitable identity 68×72

Posted by Rithya S 4 years, 9 months ago

CBSE > Class 08 > Mathematics

1 answers

Hitesh Yadav 4 years, 9 months ago

Here, 68 can be written as (70-2) And 72 can be written as (70+2) Therefore, The identity we'll use is - (a-b)(a+b) = a²-b² Hence, (70-2)(70+2) = 70²-2² = 4900 - 4 = 4896 is the answer.

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