Question

Please answer quickly. I will give brain list and thanks. I report wrong answers. Also if you could show me the work that will be great too. Thank you so much. This is an easy question

Answer 1

a<0,so the vertex is between X(1,5);

in fact vertex will be (3,8)

a(x-1)(x-5)>0

f(X)a(x-1)(x-5)

a(3-1)(3-5)=0

a= -2

function is -2(x-1)(x-5)