If x\(^2\) + 4 = 0, then x ?
4
-4
2
-2
None of the above
Explanation
Video Explanation
No video available
Post your Contribution
Discussions (16)
X² + 4 = 0
We can say
X² = -4
X² = -2²
Clearing both power
X = ±2
But none of the option say ±2 therefore the answer is none of the above
Note: -2 × -2 = 4 not -4
This simply means square root can't be applied to a negative number at the product side
Let say
X² - 4 = 0
X² = 4
X² = 2²
Clearing both power
X = 2
This can only be possible if the product side is a positive number
that y the explanation says you can't apply square root a negative number hope is clear now the real question is x²+4=0
we can use difference of two squares to solve that, thw answer is truly -2 (X-2)(X-2)=O
is correct that is a typing error is meant to be x² not x2 so E is correct i have seen the question b4
