Question

check whether 7-3x is the factor of 3x+7x

Answer 1

No. 7-3x is not the factor of 3x+7x. Now put the value of x in the equation 3x+7x

Answer 2

here g(x) = 7x - 3
x=3/7
now putting value of x in p(x)
p(x) = 3x + 7x
p(3/7) = 3. 3/7 + 7.3/7 =0 (by using remainder theorem)
= 9/7 + 3 is not equal to 0
hence 7 - 3x is not factor of 3x+ 7x