Question

19.Find the square by using the identities.
(a – 5)²​

Answer 1

Answer:

To find ( a - b)² we have identity

( a - b )² = a² - 2ab + b²

( a - 5 )² = a² - 2(a)(5) + (-5)²

= a² - 10a + 25

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Answer 2

Answer:

a^2+5^2-2×a×5

a^2+25-10a

Using = (a-b)^2 = a^2+b^2-2ab