find angle depression lighthouse 112m above sea level to boat that is at horizontal distance 1.5km from lighthouse

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.

d is the answer

step-by-step explanation:

- click here to get an answer to your question ✍ 75 i will mark one of the angles formed by two

step-by-step explanation: