Question

find 1. (x+y) (x+9)
2. (x+2y)²
​

Answer 1

1. x² + 9x + xy + 9y

2. 4x² + 4xy + 4y²

Answer 2

Answer:

$1. \: {x }^{2} + 9x + 9y + xy$

$2. \: {x}^{2} + 4 {y}^{2} + 4xy$

Step-by-step explanation:

1.(x+y) (x+9) = x² + 9x + xy + 9y

= x² + 9x + 9y + xy

2. (x+2y)² = (x+2y)(x+2y)

= x² + 2xy + 2xy + 4y²

= x² + 4y² + 4xy