Question

Find ( X + Y ) × ( X - Y ) if X = 5/2 and Y = -3/4

Answer 1

(x+y)(x-y)

= x^2 - y^2

Thus, (x+y)(x-y) at x=5/2 and y=-3/4 =

x^2 - y^2

= (5/2)^2 - (-3/4)^2

= 25/4 - 9/16

= (25×4 -9)/16

= (100-9)/16

= 91/16

Hence, (x+y)(x-y) at x=5/2 and y=-3/4 is 91/16.

Answer 2

Answer:

91/4

Step-by-step explanation:

=((5/2)+(-3/4)) x ((5/2)-(-3/4))

=(5/2-3/4) x (5/2+3/4)

=((10-3)/4) x ((10+3)/4)

=7/4 x 13/4

=91/4