writing a quadratic equation given the roots and the leading coefficient

Question

Write the quadratic equation whose roots are 3 and -5, and whose leading coefficient is 3. 

(use the letter x to represent the variable)

 

Answer= _____   =0

I do know how to do the first half but I have trouble with the second half! Please help! Thanks in advance!

 

I do not know what to do after

3 (x-3)(x+5) 

What do you to get the next step?  

Answer 1

You're just asking for the last step.  The answer is to multiply it out.

Use FOIL to multiply the two binomials, then distribute the leading coefficient (3). DONE.