Question

Oblicz wartość wyrażenia 5x do potęgi drugiej- y dla:

a) x= 3, y=2

b) x=5, y= -3

c) x=0,5 y=1/3

d) x=-1/4, y=1/5

e) x=0 y= -12

f) x= -2 y=20.

Answer 1

a) x= 3, y=2

5*9 - 2 = 45 -2 = 43

 

b) x=5, y= -3

5*25 - (-3)= 125+3=128

 

c) x=0,5 y=1/3

5*0,25 - 1/3 = 1  1/4 - 1/3 = 5/4-1/3=15/12 - 4/12 = 11/12

 

d) x=-1/4, y=1/5

5*1/16 -1/5 = 5/16 - 1/5 = 25/80 - 16/80 = 9/80

 

e) x=0 y= -12

5*0 - (-12) = 0+12=12

 

f) x= -2 y=20.

5*4 -20 = 20-20=0

Answer 2

5x²-y

 

a) x= 3, y=2              5*3²-2=5*9-2=45-2=43

b) x=5, y= -3            5*5²-(-3)=5*25+3=125+3=128

c) x=0,5 y=1/3         5*(0,5)²-1/3=5*0,25-1/3=1,25-1/3=5/4-1/3=15/12-4/12=11/12

d) x=-1/4, y=1/5      5*(-1/4)²-1/5=5*1/16-1/5=5/16-1/5=25/80-16/80=9/80

e) x=0 y= -12          5*0²-(-12)=5*0+12=0+12=12

f) x= -2 y=20.          5*(-2)²-20=5*4-20=20-20=0