Question

F(b) = 7b^3 +8b and g(b) = b ^2+ b - 10. What is f(b)-g(b)?

Answer 1

Answer:

${ \bf{f(b) - g(b) : }} \\ { \tt{ = ( {7b}^{3} + 8b) - ( {b}^{2} + b - 10)}} \\ = ( {7b}^{3} - {b}^{2} + 7b + 10)$

Answer 2

Answer:

$f(b) - g(b) = 7b^3 -b^2 + 7b +10$

Step-by-step explanation:

$f(b) = 7b^3 + 8b \\\\g(b) = b^2 + b - 10\\\\f(b) - g(b) = (7b^3 + 8b ) - ( b^2 + b -10)$

               $= 7b^3 + 8b - b^2 - b + 10\\\\=7b^3 - b^2 +7b + 10$