Question

in which of the following interval
function f(x) = 4x^2 + 3x + 5 is
decreasing​

Answer 1

Answer:

( - ∞ , -3/8)

Step-by-step explanation:

f(x) = 4x^2 + 3x + 5

f'(x)= 8x+3

f(x) is decreasing when

f'(x)<0

8x+3<0

x< -3/8

hence f(x) is decreasing in the interval (-∞, -3/8)