Question

x² + 16 = 0
Solve.

Answer 1

subtract 16 from both sides..what do you get?

Answer 2

x² = -16

Answer 3

right. now take the square root of both sides

Answer 4

answer is fake, I mean imaginary

Answer 5

yeah so its i?

Answer 6

close. i is just square root of -1

Answer 7

hmm..

Answer 8

\[\sqrt{-16} \implies i \times \sqrt {16}\]
got it?

Answer 9

no im still not understanding

Answer 10

i assume you know what the square root of 16 is?

Answer 11

\[\sqrt{-1}*\sqrt{-16}\]

Answer 12

4

Answer 13

i x 4?

Answer 14

nope..remember a square is positive and negative so square root of 16 is \(\pm\) 4

Answer 15

so \[\sqrt{-16} \implies i \times \pm 4 \implies \pm 4i\]
got it now?

Answer 16

ohhh yeah

Answer 17

thanx

Answer 18

welcome