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What is the value of ( 64^2-36^2 )?

Answer and explanation

Correct answer: (2800)

The expression is a difference of two squares. Instead of calculating both large squares separately, use the identity \\(a^2-b^2=(a+b)(a-b)\\). Here, take \\(a=64\\) and \\(b=36\\). Then \\(64+36=100\\), and \\(64-36=28\\). Multiplying these simpler numbers gives \\(100\\times28=2800\\). This method is quicker and also reduces the chance of an arithmetic error.

Therefore, the value is 2800, so option B is correct. Direct checking gives \\(64^2=4096\\) and \\(36^2=1296\\); their difference is \\(4096-1296=2800\\). The other options do not match this result. The important skill is recognising the pattern \\(a^2-b^2\\) before expanding or calculating separately.

Related tags

Difference Of SquaresNumeric ValueIdentity

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