Answer:
correct answer is option A
Step-by-step explanation:
given,
(2 x + 5 y)².................(1)
using identity of
( a + b )² = a² + b² + 2 a b
using identity in equation (1)
(2 x + 5 y)² = (2 x)² + (5 y)² + 2 × (2 x) ×(5 y)
(2 x + 5 y)² = 4 x² + 25 y² + 20 x y
hence on solving the equation by using identity we get
(2 x + 5 y)² = 4 x² + 25 y² + 20 x y
so, the correct answer is option A
