Answer: 21
Step-by-step explanation:

Substitute the value of z into the expression:

It will have 2 solutions! this is because a negative and a negative cancel each other out and will make a positive under the radical.
Answer:
200-225
Step-by-step explanation:
trust me haha
Answer:
a 3 + b 3 = (a + b) (a 2 − a b + b 2 ). Substituting a = x and b = 3 into the formula yields: x 3 + 27 = (x + 3) (x 2 − 3 x + 9).
Step-by-step explanation: