Answer
Error: The functions were added.
CORRECT ANSWER
$f(x)g(x)=21x^2-46x-80 $
Work Step by Step
The product of polynomials is not correct. The student has committed the error in adding the two functions instead of multiplying them.
CORRECT METHOD
$f(x)g(x)=(3x-10)(7x+8)$
$f(x)g(x)=3x(7x+8) -10(7x+8) $
$f(x)g(x)=21x^2+24x-70x-80 $
$f(x)g(x)=21x^2-46x-80 $
