Find The Equation. The intercepts of the parabola are (-1,0), (5,0) and (0,15)

Question

.HELPPPP PLZ

Answer 1

As with your other question, you can deduce the formula fairly easily

 

your roots are -1 and 5, so your factors are (x + 1) and (x - 5)

 

y = a(x + 1)(x - 5)

y = a(x² - 4x - 5)

 

when x = 0

 

y = a[(0)² - 4(0) -5]

y = a (-5)

 

so if f(0) = 15,

15 = a (-5)

-3 = a

 

so, y = -3(x² - 4x - 5)