answer 4 question just like how the example goes please thank you! step 1-5

EXAMPLE 5. BEHAVIOR OF A FUNCTION: NO GRAPH GIVEN Given the polynomial f(x) = '(2 5x + 6. Find the open intervals where the function is increasing or decreasing. Locate all points where the tangent line is horizontal. SOLUTION: Given: Step 1: Compute for the first derivative. Step 2: Solve for the critical points. Equate P(x) = O and solve for x. = O = 2.5 Critical Point at x = 2.5. There is only one critical point.