Question

2)
8xy -- 3y + 2 ( 9x - 5y + 4 ) if x = 3, y = - 4

Answer 1

8xy-3y + 2(9x-5y+4) = 18

Explanation:

We need to find the value of the given expression:

8xy-3y + 2(9x-5y+4) ....(1)

when x = 3 and y = -4

Put the values of a and y in equation (1)

8×3×(-4)-3(-4)+ 2(9×3-5(-4)+4)

= -96 +12 + 2(27 + 20 +4)

= -84 + 2(51)

= -84 + 102

= 18

Hence, the value of the given expression is 18.