A^2-8a-48=0
factor
(a+4)(a-12)=0
set each equal to 0
a+4=0 a-12=0
a=-4,12
Bob found out that he can dig 8 inches down every minute. If he wants to put a 5 foot stick in the hole with 28 inches showing, how long does he have to dig?
(so to solve you convert 5 feet to 60 inches then do the equation -8x+60=28 then you add 8x to both sides, subtract 28 then divide by 8 leaving you with 4 minutes)
Answer: B
Step-by-step explanation:
Answer:
-2.5 (decimal) or -5/2 (fraction)
Step-by-step explanation:
For this case we must find the product of the following expression:

We have to by law of signs of multiplication:

Also, by definition of multiplication of powers of the same base, we put the same base and add the exponents, then the expression is rewritten as:

Answer:
