Use the x-intercept method to find all real solutions of the equation. x^3 - 9x^2 + 23x - 15 = 0
x = 1, 3, or-5
c. x= -1, -3, or 5
b. x = 1, 3, or 5
d. x=-1, -3, or -5
a.
Please select the best answer from the choices provided

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.

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart