Question

(4x+5y) (4x-5y) find the value​

Answer 1

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

= (4x)² -(5y)²

=16x²-25y².

used formula: (a+b)(a-b)= a²-b²

Answer 2

Answer:

$\large\bold\green{☑Verified Answer:-}$

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$(4x + 5y)(4x - 5y) = (4 {x}^{2} ) -( 5 {y}^{2} ) \\ = 16 {x}^{2} - 25 {y}^{2}$

where,

$a = 4x \: and \: \: b = 5y \\ identity = (a + b)(a - b) = {a}^{2} - {b}^{2}$