Question

check whether 7+3x I'd a factor of 3x^3 + 7x​

Answer 1

${3x}^{3} + 7x$

$= 3 { \binom{ - 7}{3} }^{3} + 7 \binom{ - 7}{3}$

$= 3 \frac{ - 343}{9} - \frac{49}{3}$

$= \frac{ - 343 - 147}{9}$

$= - \frac{490}{9}$

hope it helps u...!!

Answer 2

${3x}^{3} + 7x$

$= 3 { \binom{ - 7}{3} }^{3} + 7 \binom{ - 7}{3}$

$= 3 \frac{ - 343}{9} - \frac{49}{3}$

$= \frac{ - 343 - 147}{9}$

$= - \frac{490}{9}$

hope it helps u...!!