Question

if x=5and y=2 then verify x2-y2= (x+y) (x-y) ​

Answer 1

Answer:

Step-by-step explanation:

(x+y)²=x²+2xy+y²

(5+2)²= 5²+2×5×2+2²

7²= 25+20+4

49 = 49

Answer 2

Answer:

If x =5 , y = 2, then $x^2 - y^2 = (x + y)(x - y)$ = 21

Step-by-step explanation:

$x^2 - y^2 = (x + y)(x - y)$

If x = 5 and y= 2

LHS = $x^2 - y^2$

Put the value of x and y

$= x^2 - y^2\\= (5)^2 - (2)^2\\= 25 - 4\\= 21$

RHS = (x + y)(x - y)

Put the value of x and y

= (5 + 2)(5 - 2)

= 7 (3)

= 21

So, LHS = RHS = 21

$x^2 - y^2 = (x + y)(x - y)$