Question

Which of the quadratics has a graph with x-intercepts of 5 and -1?



A)
y = x2 - 4x - 5


B)
y = x2 - 5x - 4


C)
y = x2 + 4x - 5


D)
y = 2x2 - 4x - 5

Answer 1

the x-intercepts are the roots right?

Answer 2

alll polynomials that have roots 5 and -1 are of the form \(a(x-5)(x+1) = a(x^2-4x-5)\). Find the one in your options that looks like that. (\(a\) may be equal to 1, -1, 2, .. something..)

Answer 3

check A
y = x2 - 4x - 5