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ACT Math practice questions and answers

In the complex numbers, where , the conjugate of any value a + bi is abi.What is the result when you multiply 2 + 7i by its conjugate?

(A) 45

(B) –45

(C) 45i

(D) 53

(E) 53i

The Correct Answer
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Explanation

The ACT Math Test usually breaks down into 6 questions types: pre-algebra, elementary algebra, and intermediate algebra questions; plane geometry and coordinate geometry questions; and some trigonometry questions.