Now
Answer:
7/3
Step-by-step explanation:
5 - 3(2a+1) = -4 + 10
=> 5 - 6a + 3 = 6
=> 5 - 6 + 3 = 6a
=> 2 = 6a
=> 6a = 2
=> a = 2/6
=> a = 1/3
a + 2
1/3 + 2
=> 1/3 + 6/3
=> 7/3
what formula is applied, I mean what method
This is already solved, and this would not be considered a inequality since it has only a equal sign.
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: