Question

pls answer pls answer​

Answer 1

Answer:

79

Step-by-step explanation:

(a-1)(a+1) = 79² - 1

Now, we know that (a+1)(a-1) = a² + b²

∴ (a+1)(a-1) = a² - b²

Hence, a² - 1² = 79² - 1²

∴ (a+1)(a-1) = (79+1)(79-1)

Hence, a is 79.

I hope this helps you a lot mate!!

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Answer 2

Answer:

here, a=79

Step-by-step explanation:

hope it will be helpful for you....

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${a}^{2} - {b}^{2} = (a - 1)(a + 1) \\ {79}^{2} - {1}^{2} = (79 - 1)(79 + 1)$