Factor s2-4s-12 using the AC method.
Consider the form x2+bx+c. Find a pair of integers whose product is c and whose sum is b. In this case, whose product is -12 and whose sum is -4.
Write the factored form using these integers.
Factor 3 out of 3s-6.
Factor 3 out of 3s.
Factor 3 out of -6.
Factor 3 out of 3s+3⋅-2.