The sum of two numbers is 17 the difference of the two number is 13 what are the numbers

x = 15 ; y = 2

Step-by-step explanation:

x + y = 17

x - y = 13

x + y = 17

x = 17 - y

17 - y - y = 13

17 - 2*y = 13

- 2*y = 13 - 17

- 2*y = -4

y = -4 / -2

y = 2

x + y = 17

x + 2 = 17

x = 17 - 2

x = 15

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

exactly you go it

step-by-step explanation: