Question

Given that (x +y ) = 7 and (x - y ) = - 3 find the value of
X^2 - Y^2

Answer 1

Answer:

-21

Step-by-step explanation:

7x-3 = 21

this is algebra of class 7

Answer 2

Answer:

x+y=7

x-y=-3

by elimination method

x+x=7+(-3)

2x=4

x=2

if x=2 then from eq1

y=7-x

y=7-2

y=5

x^2-y^2

=(2)^2-(5)^2

=4-25

=-21