Question

If A= 2x
2 – 3xy + 5y
2
, B = - y
2 + 5xy - x
2
and C = 7x
2 – 7 y
2 + xy ,
find A -2B +C and also find the value when x = -1 and y = 2 .

Answer 1

Step-by-step explanation:

here A=2x,B=-y,C=7x

A-2B+C=2x-2y+7x

=-2-4-7=-13