Question

Which of the following linear expressions cannot be factored A.15x-10 B.4x+8 C.3x+8 D.2x-2

Answer 1

Well of factors is defined as something that is able to go into the other, then th answer is C. 3 is not a factor of 8. the other fit in well.
for example, 15x-10. 5 is a factor which go into both.
4x+8. 4 is the HCF (highest common factor) which can go into both..
Answer is C.

Hope this helps :)