Question

find 1. (x+y) (x+9)
2. (x+2y)²
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Answer 1

Step-by-step explanation:

1) (x+y)(x+9) =x²+9x+xy+9y

=x²+(9+y)x+9y

2)(x+2y)² = x²+4y²+2×x×2y

= x²+4y²+4xy

hope this helps you