...here you have the product of two polynomial, and that product will e equal to zero if either one or both of them is equal to zero
so, take this factor and find that makes it equal to zero
...use quadratic formula..(don't be confused with unknown variable labeled with , same as a coefficient )
solutions:
now, do the same with second factor in given product
solutions:
so, there are four solutions because, if you multiply given polynomials you will get polynomial of fourth degree
