-((x + 2)(x - 9))
-((x + 2)(x - 9))
(x - 6)(x - 3)
(x - 3)(x + 6)
(X+9)(x-2)
false!
(x+2)(x-9)
(x + 2)(x - 9)
(a - 6)(2a + 3)
-2 + (-18) = -20
The expression (4z^4 - 11z^2 + 25z - 18) is not a trinomial; it is a polynomial with four terms. A trinomial specifically has three terms. In this case, the terms are (4z^4), (-11z^2), (25z), and (-18).
You have to find two numbers whose sum is -18, and whose product is 3. Experimenting with different combinations of factors for 18, you find that this is 6 and -3, so the factors are (x+6)(x-3).
That doesn't factor neatly. Applying the quadratic formula, we find two real solutions:9 plus or minus 3 times the square root of 7x = 16.937253933193773x = 1.0627460668062279