Answer:
x = 4 and y = - 5
Step-by-step explanation:
note that the product of a complex number and it's conjugate is real
That is
(a + bi)(a - bi) where a, b are real
= a² - abi + abi - b²i²
= a² + b² ← a real number
For (4 + 5i)(x + yi) to be real
we require (x + yi) to be the conjugate of 4 + 5i , that is 4 - 5i
(4 + 5i)(4 - 5i) ⇒ x = 4 and y = - 5
The answer to your question is D. 512
Answer
The Associative Property of Addition
Step-by-step explanation:
Because according to that property, you can group any two numbers and the answer will be the same.
Answer:
Hi there your answer is 
Step-by-step explanation:
Hi... You have to muliply 4 and 2 which will equal to 8
Then, if you know the exponent rule for the Product Rule or don't I'll still give it you here it is
In this case we will be adding 3 and 3 which will equal to 6
Which your answer will be
