Question

the product of two numbers is 175 and one number is -7 find other ...... please explain this​

Answer 1

Answer:

The answer is that both of the numbers have to be 150.

Let x is one of the two number, the other one is 300−x, so the function product is:

y=x(300−x)⇒y=300x−x2, abd now let's find the maximum of the function:

y'=300−2x that is positive in (−∞,150)and zero in 150.

So, before 150 the function grows, and after 150the function decreases.

So the number 150 is the local maximum of the function.