Z^2-3z-54 for factorisation for grade 8.

(z - 9)(z + 6)

Step-by-step explanation:

Given

z² - 3z - 54

Consider the factors of the constant term (- 54) which sum to give the coefficient of the z- term (- 3)

The factors are - 9 and + 6, since

- 9 × 6 = - 54 and - 9 + 6 = - 3 , thus

z² - 3z - 54 = (z - 9)(z + 6)

answer:

step-by-step explanation:

here, the total dishes = 10

dishes having meat = 3 ( chicken, meatloaf and hamburger )

thus, the probability of having meat on the chosen dishes = number of dishes having meat / total dishes

=

therefore, the probability of not having meat = 1- the probability of having meat on the chosen dishes

=

=

=

⇒ option b is correct.