The expression `x^4+4` can be factorized as (a) `(x^2+2x+2)(x^2-2x+2)` (b)`(x^2+2x+2)(x^2+2x-2)` (c)`(x^2-2x-2)(x^2-2x+2)` (d) `(x^2+2)(x^2-2)`

Explanation

To factor the expression \( x^4 + 4 \), we can follow these steps:

### Step 1: Rewrite the expression
We start with the expression:
\[ x^4 + 4 \]

### Step 2: Introduce a zero term
We can add and subtract \( 4x^2 \) (which is zero) to the expression:
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