Write a quadratic equation with roots of 1 3 and − 7 2 . a) y = 6x2 - 19x - 7 b) y = 6x2 + 19x - 7 c) y = 7x2 - 19x - 6 d) y = 7x2 + 19x - 6

If the roots are 1 and 3, the factors of this quadratic are (x-1) and (x-3).
The polynomial is x^2 - 4x + 3.

If you were supposed to write a polynomial based upon all four given roots, then:

Looks as tho' you have four distinct roots.  The 4th order polynomial with these roots is f(x) = (x-1)(x-3)(x-7)(x-2).  Multiply this out, combine like terms and then arrange the terms in descending order by powers of x.