aq1.9 qn5

[Sree Kavitha]

can any one pl expalin  

[Mathematics 1 Support 2]

Hi please see the following hints:

1. In option one there is the square root. A square root creat the problem for a function regarding the injection criterion because it provides two values as output, one negative and one positive. But here only positive values are taken so there is no problem. The square root of a number is unique in the positive zone for output so there is nothing that violates the injection rule.

2. In option 2, after a little bit of arrangement, f(X) = 7/3 + 1/2x. This function only has one problem that is x should not be zero. But regarding the one-one function, it is clear that the one input and one output.

3. In option 3, the function is a straight line, which is always one-one.

4. In option 4, the function is quadratic which means tow input will prove one output.