Question

Check weather 7+3x is a factor of 3xcube+7x

Answer 1

7x+3=0

x=3/7

3x³+7x

-> 3*(27/343)+3

=0.33+3. =3.33

Answer 2

Answer:

Step-by-step explanation:

7 + 3x = 0

3x = -7

x = -7/3

p(x) = 3x^3 + 7x

p(-7/3)  = 3(-7/3)^3 + 7(-7/3)

            = 3(-343/27) + -49/3

            = -343/9 + -49/3

            L.C.M of 3 and 9 = 9

            =  \frac{-343}{9} + \frac{-49 x 3}{3 x 3}

            = \frac{-343 + -147}{9}

            = \frac{-490}{9}

490/9 ≠   0

Therefore 7 + 3x is not a factor of 3x^3 + 7x