Answer:
in 84 minutes or 1 hr, 24 min
Step-by-step explanation:
you need to find the least common multiple of 2, 3 and 28 which is 84
-9.375
2 1/2 x (-3 3/4) = -9.375
If is a factor of the polynomial, it means that is a root of the polynomial.
In fact, if a polynomial has a root (i.e. ), then the polynomial is divisible by
In your case, you know that the polynomial is divisible by , so is a solution.
Let's evaluate and set it to zero:
We can check the answer: if the polynomial becomes
And we're claiming that is a root of this polynomial: