Hi im having some difficulty in solving two quadratic equations shown below. i think i have answered the first one by using the quadratic formula

a) 2x²+15x+16=0 My Ans: -1.29 or -6.21

b) (2x-1)(3x+2) - (x+3)(2x+1) = 0 ?

Also a quick question, if a quadratic equation does not have a equal zero do i need to do something to the expression before trying to solve the quadratic.

Many thanks in advance

Richard