Question

Q 10 Find the square of 405 using the identity (a + b)2 = a + 2ab + b2.
Q 11 Find the square of 395 using the identity (a - b)2 = 22 - 2ab + b2.​

Answer 1

Answer:

Q.10=(400+5)²

=(400)²+2*400*5+(5)²

=160000+4000+25

=164025

Q.11=(400-5)²

=(400)²-2*400*5+(5)²

=160000-4000+25

=156025

Hope it will help u

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