Question

(4a+9)²Sum Algebra expansion​

Answer 1

Answer:

(4a+9)²

According to the Identity (a+b)² = a²+2ab+b²

= (4a)²+2(4a)(9)+(9)²

= 16a²+72a+81.

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Answer 2

Answer:

(4a+9)² ... (1)

using (a+b)²=a²+b²+2ab in (1)

=(4a)²+(9)²+2×4a×9

=16a²+81+72a

I hope it will help you thanks for asking