Is f(x)=sqrt{x}+3x an exponential function?

Clarence wants to buy a new car. he finds an ad for a car that costs 27,200 dollars. suppose his local sales tax is 7%. -how much would he have to pay? -what is the cost of the car including tax? -if clarence has 29,864 saved, can he pay cash to buy the car?

What are two numbers that add up to -9 and multiply to -10 best answer gets branliest and 100 extra points

How is this equation completed? i cannot find any examples in the book.