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प्रश्न
The factors of x2 – 4 are ______.
विकल्प
(x – 2), (x – 2)
(x + 2), (x – 2)
(x + 2), (x + 2)
(x – 4), (x – 4)
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उत्तर
The factors of x2 – 4 are (x + 2), (x – 2).
Explanation:
We have,
x2 – 4 = x2 – 22
= (x + 2)(x – 2) ...[∵ a2 – b2 = (a + b)(a – b)]
Hence, (x + 2), (x – 2) are factors of x2 – 4.
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