Question

Explain why 7 x 11 x 13 + 13 is a composite number. [2 MARKS]​

Answer 1

$\huge question :$

Explain why 7 x 11 x 13 + 13 is a composite number.

$\huge solution :$

$\mathtt \: Let's \: consider$

$\tt 7×11×13+13$

$\mathtt 13 \times (7 \times 11 + 1) \\ \tt = 13 \times (77 + 1) \\ \tt = 13 \times 78 \\ \tt \implies \: 7 \times 11 \times 13 + 13 = 2 \times 3 \times 13 \times 13$

Theorem says that "every composite numbers can be expressed as products of primes" and we just did that.

Its a composite number.

Answer 2

Answer:

Step-by-step explanation:

7 x 11 x 13 + 13

= 13 * ( 7*11  + 1)

= 13 * 78.

So it is a composite number . It has more than two factors.