Question

Q2.Evaluate using identity. (4x+5y)(4x-5y)

Answer 1

(4x)^2-(5y)^2
16x^2-24y^2

Answer 2

hello Frnd

here (4x+5y) (4x-5y)

we can use
$(a + b)(a - b) = {a}^{2} - {b}^{2}$
a = 4x and b = 5y

by using above formula we get

$= {16x}^{2} - {25y}^{2}$


hope it helps
#jerri