Which student correctly used guess and check to determine the unknown number?
The product of a number and eight is 104.

Hello! Remember you need to write complete questions in order to get good and exact answers. Here we know nothing about the students so I can only help you providing the correct steps to find the product of a number and eight is 104:

Let that number be , then the statement can be written in a mathematical language as follows:

Finally, the unknown number is 13

f(x) = x^3 -2x^2 -3x

x( x^2 -2x-3)

x( x^2 +x -3x -3)

x( x(x+1) -3(x+1))

x( x-3)( x+1)

so zeroes are 0, 3,-1

its (2) option

the answer is a

step-by-step explanation: