Question

(x+2y)² = x²+[ ? ]+4y²​

Answer 1

Answer:

? = 4xy

Step-by-step explanation:

(x+2y)^2

→ x^2+[ 2(x)(2y)]+y^2. [(a+b)^2=a^2+b^2+2ab]

→x^2+[4xy] +4y^2

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Answer 2

Answer:

(x+2y)² = x² + 4xy + 4y²

because,

a = x , b = 2y

according to Formula,

(a+b)² = a² + 2ab + b²

substitute the value

(x+2y)² = x² + 2(x)(2y) + (2y)²

= x² + 4xy + 4y²

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