Question

If x²+1=0 then x is equal to -
a. -1
b. -li
d. 0
d. None of these​

Answer 1

Answer:

d (0)

Step-by-step explanation:

x^2 +1=0

x^2=0+1

x^2=1

Answer 2

Answer:

B

Step-by-step explanation:

lets go through this step by step

$x {}^{2} + 1 = 0 \\ x {}^{2} = - 1 \\ x = \sqrt{ - 1} \\ we \: know \: that \: \sqrt{ - 1} is \: an \: imaginary \: number \: \\ so \: we \:can \: write \: \sqrt{1} \times \sqrt{ - 1} \\ the \: sqare \: root \: of \: 1 \: is \: one \: \sqrt{1} = 1 \\ which \: gives \: 1i \\ because \: \sqrt{ - 1} = i$

The answer can be positive or negative because X is a square

your options have a negative one so that is correct

-1i is correct