Question

solve 71 square - 69 square​

Answer 1

Answer:

280

Step-by-step explanation:

>> 71² - 69²

>> (70 + 1)² - (70 - 1)²

Using Formula a² - b² = (a + b)(a - b)

>> [ 70 + 1 + 70 - 1 ] [ 70 + 1 - ( 70 - 1 ) ]

>> [ 70 + 70] [ 70 + 1 - 70 + 1 ]

>> [ 70 + 70] [ 1 + 1 ]

>> 140 x 2

>> 280

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Answer 2

Answer:

280

Step by step explanation :

=>71^2-69^2,, is of the form a^2-b^2 = (a-b) (a+b)

=>(71-69)(71+69)

=>2×140

=>280

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Hope this helps u