Question

Using suitable identity find each of the following (i) (x+3y)(x+3y)

Answer 1

Answer:

(x+3y)²

Step-by-step explanation:

(x+3y)(x+3y)

=x² + 9y² + 3yx + 3yx

which can be written as

(x+3y)²

Answer 2

[x+3y][x+3y]

therefore, [a+b]^2= a^2+2ab+b^2

[x+3y}{x+3y} can be written as [x+3y]^2

                    = x^2 + 2[x][3y]+ 3y^2

                    = x^2 + 6xy + 9y^2