Question

Factor:
n^2+4n-21

Answer 1

quadratic is (-4 +-sqrt(100))/2

Answer 2

you need two numbers whose product is -21 and sum = + 4
then insert them into the blank spaces:
(n )(n )

Answer 3

(n+7)(n-3) gives n=-7 and n=+3

Answer 4

that would be correct

Answer 5

MCronin, your way involves less trial and error ;) I can appreciate that!

Answer 6

the question asked to factor the function so answer is
(x+7)(x-3)

Answer 7

True, but the quadratic formula is useful in finding those factors as well. One method is not more "right" than the other.