Question

Given that f(x) = 15x2 + 360, find x. A) x = ±2i 3 B) x = ±2i 6 C) x = ±3i 5 D) x = ±3i 6

Answer 1

Correct option is:

B) x = ±2i√6

Explanation:

We have to find x for f(x)=15x²+360

i.e. those values of x for which

15x²+360=0

or 15x² = -360

Dividing both sides by 15, we get

x² = -24

Taking square root on both sides, we get

x= ± 2i√6

Hence, Correct option is:

B) x = ±2i√6

Answer 2

Given with the function of x which is f(x)=15x² + 360, we are tasked to solve for the value of x. The solution was discussed and shown below:
Set x=0, then we have:
0=15x² + 360
Transpose 360
15x²= -360
Divide by 15
x²= -360/15
x²= - 24
x = sqrt 4*6i
Therefore, the answer is letter B.