Question

find the square of
$(5x + 2y)$

Answer 1

(5x +2y)^2
(5x)^2+2×5x×2y+(2y)^2
25x^2+20xy+4y^2

Answer 2

Answer:

Step-by-step explanation:

squaring first equation

(5x-2y)^[2]=[7]^2

25x^[2]+ 4y^[2] - 20xy=49

25x^[2]+ 4y^[2] - 20{2]=49

25x^2+ 4y^[2] = 49 - 40

25x^[2] + 4y^[2] = 9

now

(5x+2y)^[2]=25x^[2]+4y^[2]+20xy

putting the values found above

9+20{2}

║49║

PLEASE MARK BRAINLIEST