Question

What is the answer of (5×+4y)(5×-4y)

Answer 1

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

$= {(5x - 4y)}^{2}$

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

$= 25 {x}^{2} - 16 {y}^{2} + 40xy$

HOPE THIS MAY HELP YOU OUT............

Answer 2

The answer of this question is $(5x+4y)(5x-4y)=25x^{2} -16y^{2}$.

Step-by-step explanation:

• We are given with the equation,

         $(5x+4y)(5x-4y)$

• Formula used,

we use following formula for solving the equation,

$(a+b)(a-b)=a^{2} -b^{2}$  

• Solving equation

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

Here we can take 5x as 'a' and 4y as 'b' for simplifying the equation.

By using above formula we get answer as

$a^{2}-b^{2}=(5x)^{2} -(4y)^{2}$

            $=25x^{2}-16y^{2}$

 So the answer of this question is $25x^{2} -16y^{2}$.