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

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

reemii · Answer

the x-intercepts are the roots right?

reemii · Answer

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..)

anonymous · Answer

check A
y = x2 - 4x - 5