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But there is a minus
so then what would it be?
check your equation plz
that was the equation given to me
one of my answers is prime, is that the answer?
Orime would be correct
use the discriminant b^2 - 4ac
there are no numbers that multiply to -36 but add to make 20
okay thanks :)
x^2 + 20x − 36.
a*c <----36 x 1 =-36
You are trying to factor a trinomial of the form:
\(x^2 + ax + b\)
For this type of factoring, you need to find two numbers whose product is b and whose sum is a.
In this case, you need two numbers whose product is -36 and whose sum is 20.
If two such numbers do not exist, then the trinomial is not factorable, so it's prime.
Factors of -36 Sum of the factors
-1, 36 35
-36, 1 -35
-18, 2 -16
-2, 18 16
-12, 3 -9
-3, 12 9
-9, 4 -5
-4, 9 5
-6, 6 0
As you can see, there are no two factors of -36 which have a sum of 20. That means this trinomial is not factorable. it is prime.