Question

Find the product using formula (a+b) (a-b) = a square + b square a.61×59. Note: Solve by using formula.

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Answer 1

`\huge\boxed{\sf 3599}`

Explanation:

= 61 × 59

You can write 61 = 60 + 1 and 59 = 60 - 1

Hence,

= ( 60 + 1 ) ( 60 - 1 )

According to the formula:

`(a+b)(a-b) = a^2-b^2`

= (60)² - (1)²

= 3600 - 1

= 3599

`\rule[225]{225}{2}`

Hope this helped!

~AH1807

Peace!