The answer is: (z - 6)(z + 15)
z² + 9z - 90 = z*z + 15z - 6z - 6*15 =
= (z*z + 15z) - (6z + 6*15) =
= z(z + 15) - 6(z + 15) =
= (z - 6)(z + 15)
You keep the same sign. So:-
4 + 4 = 8 and
--4 + -4 = -8
Answer:Third one
Step-by-step explanation:
One expression: 0.75 x 55
another expression: (100% - 25%) x 55
Answer: No
Explanation: There is a rule that stays that a triangle's 2 least sides must add up to be greater than the biggest side. 3.2 plus 2.4 is not greater than 6.1.
