Question

Explain why 5x7x11+11and 5x6x7x8+8 are composite numbers

Answer 1

Explanation:

5*7*11+11

put common outside

11(5*7*1+1)

11(35+1)

11(36)

11*3*2*2*3

so it have factors 11*3*2*2*3*1*itself

the no. having factors more than 2 is a composite no.

5*6*7*8+8

put commin outside

8(5*6*7*1+1)

8(210+1)

8(221)

it have factors 8*221*1* itself

any no.having factors more than two is a composite no.