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Explain why 3×-5×7+7 is a composite …

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Explain why 3×-5×7+7 is a composite number.

Posted by Ziya Ferzin 5 years, 8 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 6 months ago

We have, (3 × 5 × 7) + 7 = 105 + 7 = 112

Prime factors of 112 = 2 × 2 × 2 × 2 × 7 = 2^{4 {tex} \times {/tex}} 7

So, it is the product of prime factors 2 and 7, i.e. it has factors other than 1 and itself. Hence, it is a composite number.

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