Question

If x =a and y=b is the paira of the equation x-y=5 and x+y=3,find a and b . Show that 12^n cannot end with the digit 0

Answer 1

Answer:

a=4 and b=-1

Step-by-step explanation:x=a and y=b

therfore ,

a-b=5; a+b=3

a-b=5

a+b=3

-2b=2

b=-1

puting the value of b

we get a

a-b=5

a-(-1)=5

a+1=5

a=5-1

a=4

12 cannot end with 0 coz. factors of 12 are not in 2^n*5^m

factors are

12=2*6

  =2*2*3

  =2^2*3

hope it may help u