Question

find the solutions of the quadratic equation (-9x^2 + 49 = 0).

a) (x = \frac{7}{3}, -\frac{7}{3})
b) (x = \frac{3}{7}, -\frac{7}{3})
c) (x = \frac{9}{7}, -\frac{9}{7})
d) (x = \frac{7}{9}, -\frac{7}{9})

question 10 (5 points)
multiply ((6 - 5i)^2).

a) (11 - 60i)
b) (36 - 25i)
c) (11 + 60i)
d) (36 + 25i)

question 11 (5 points)
add the complex numbers: ((4 + 8i) + (-2 - i)).

a) (2 + 9i)
b) (6 + 7i)
c) (6 + 9i)
d) (2 + 7i)

Explanation:

Solve the quadratic equation

$$
LATEXBLOCK0
$$

Multiply the complex numbers

$$
LATEXBLOCK1
$$

Add the complex numbers

$$
LATEXBLOCK2
$$

Answer:

Question 9

• (A) \(x = 7/3, -7/3\) (Correct answer)
• (B) \(x = 3/7, -7/3\)
• (C) \(x = 9/7, -9/7\)
• (D) \(x = 7/9, -7/9\)

Question 10

• (A) \(11 - 60i\) (Correct answer)
• (B) \(36 - 25i\)
• (C) \(11 + 60i\)
• (D) \(36 + 25i\)

Question 11

• (A) \(2 + 9i\)
• (B) \(6 + 7i\)
• (C) \(6 + 9i\)
• (D) \(2 + 7i\) (Correct answer)