-7x+y^3+7x^3+6x-3y^3-2x^3+3x

5x^3 + 2x - 2y^3

Step-by-step explanation:

-7x + y^3 + 7x^3 + 6x - 3y^3 - 2x^3 + 3x

group like terms

= 7x^3 - 2x^3 - 7x + 6x +3x + y^3 - 3y^3

add similar elements

= 5x^3 - 7x + 6x + 3x + y^3 - 3y^3

add similar elements

= 5x^3 + 2x + y^3 - 3y^3

add similar elements

= 5x^3 + 2x - 2y^3

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

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.