Question 192297
Identify the form, this one is (b+ )(b- )
Identify the third factor (40) that would add and subtract to get -6.
 1*40
 2*20
[4*10] <--- This one subtracts to get -6
Since the second term is a negative the bigger number gets the subtraction part.



Answer: (b+4)(b-10)



Check: b(b-10)= b^2-10b
       4(b-10)= 4b-40

b^2-6b-40