you need to factor it using the AC method. then we need to find
two numbers the multiply and give us 30 and add to 13. those
numbers are 10 and 3. so now we split the 13x up to be 10x+3x
then factor by grouping 5x^2+10x+3x+6=0 group the 1st 2 and the
2nd 2 (5x^2+10x)+(3x+6)=0 then factor out the common factor of
each group 5x(x+2)+3(x+2)=0 then factor out the parentheses as a
common factor (x+2)(5x+3)=0 then set each parenthesis equal to 0
and then solve