16x² - 49
= (4x)² - 7²
Identity =》 a² - b² = (a + b) (a - b)
(4x)² - 7²
= (4x + 7) (4x - 7) [3rd option]
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Hope it helps ⚜

It is prime because it has no common factors in 5a^2 and b.
The answer is
A<span>
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Answer:
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