Question

find the value of the following expressions for ( x =2) and (y = -2) ​

Answer 1

Answer:

Given x=1,y=2

(i) 4x−3y+5=4(1)−3(2)+5=4−6+5=3

(ii) x

2

+y

2

=(1)

2

+(2)

2

=1+4=5

(iii) xy+3y−9=(1)(2)+3(1)−9=2+3−9=−4

Answer 2

2x²y²-3xy+6

Given x=2,y=-2

(i) 4x−3y+5=4(1)−3(2)+5=4−6+5=3

(ii) x 2 +y

2=(1) 2+(2) 2 =1+4=5

(iii) xy+3y−9=(1)(2)+3(1)−9=2+3−9=−4