monthly salary of Mr. Koko was #320 for each of the first 3 years of his service period. He got annual services increement of #40 per month each of the following successive 12 years and his salary remains constant till retirement. During the calculation of his retirement benefits, it was observed that Mr. Koko average monthly salary during his service year was #698. Determine the number of years he spent in his service.?

square root

step-by-step explanation:

typically if you want , you would actually put questions here for us to you. but hey, that's just me. maybe someone will magically answer the questions for you without knowing what they are.

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.