Answer:

(x+7y)²

Step-by-step explanation:

x²+14xy+49y²

1st. get the perfect square of x² (so that's x)

2nd. Get the perfect square of the last term ( yung 49y²) so square of 49 is 7y. (7x7=49).

3rd. After you got the perfect square of 1st term ( yung x) and 3rd term. (yung 7)

Now. multiply them (x+7y) times 2.

multiply 7xy by x = 7xy (then times 2)

7x2= 14. just copy the sign of last term (49. there is a variable which is y) 14xy. (We got the (x) from the square of x².

(noticed the middle term of the question? (x²+14xy+49y²) that's 14xy.

You will get that if you multiply the square of 1st and 3rd term (yung x and 7).