Question

Eric plugged a number into one of the machines and got an output of o.

a. Which machine did he use? Type left or right.
b. What number did he input to get an output of o?
a.
b.
y=x² +3
y=√x-2

Answer 1

a) He used the machine on the right

b) 4

Explanation:

a) whatever number you insert on the left machine (y=x²+3), we will always get a number even if you put 0. but on the right machine (y=sqrt•x -2) we have a value to make the output 0

b) if you insert 4 on the right machine,

y=sqrt•4-2

y=2-2

y=0