Question

Find the square of 39 using an identity

Answer 1

Answer:

1521

Step-by-step explanation:

39²

=(40-1)²                                                   [(a-b)²=a²+2ab+b²]

=40² - 2×40×1 + 1²

=1600 - 80 +1

=1521

Answer 2

 I will use (a + b)²

Break down 39 into 30 + 9

( 30 + 9)²

(30)² + 2 × 30 x 9 + (9)²

900 + 540+ 81

1521      

That's it !!!!!!

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