HELP! Im Stuck On A Exam Prep Question!

[jokerrules]

Hey I got stuck on this question for my exam review and I would love it if someone showed me how to solve them...thanks :

Write an quadratic equation that has each pair of roots:
a.0,4
b.-4,7
c.1/2,3/5
d.-7/2,5

Thanks for anyones help!

 

[pka]

If each of a and b is a number then the quadratic (x−a)(x−b)=0 has those numbers as roots.