Question

find the following products and verify the result for X= - 1 y =2 ​

Answer 1

1) [ x^2 -( 1/ 2x^2 )] [ 1/3* x^2 + 1/ x^2]

.. put X = -1

= [ 1- ( 1/2 ) ] [ 1/3 + 1/1 ]

= ( 1/2 ) ( 4/3 )

= 4/6

= 2 / 3

2) ( 3/5* X - y/2 ) ( 5/3 * X + 6y )

.. put X = -1 and y= 2

= ( 3/5 * -1 - 2/2 ) ( 5/3 * -1 + 6*2 )

= ( -3/5 - 1 ) ( -5/3 + 12 )

= ( -8/5 ) ( 31/3 )

= -248 / 15

OR

= - 16.53