Question

If f(x)=2x² + 4x-14 and g(x) = -x³ + 15x then what is (f+g)(3)?

Answer 1

soln;Here

Given,

f(x)=2x² + 4x - 14

g(x)= x³ + 15x

(f + g)(3)= ?

Now,

(f + g)(3) = f(3) + g(3)

=2×3³- 14 + 3³ + 15 × 3

=2 × 27 - 14 + 27 + 45

= 54 - 14 + 27 + 45

= 54 - 14 + 7

=61 - 14

= 47..

Hence the value of f + g)(3)= 47