Post a New Question

college algebra

posted by .

Need help finding the x-intercepts
y=x^3+x^2-100x-100
I know that the answer is (10,0),(-10,0),(-1,0) I don't understand how to get (-10,0) and (10,0)

  • college algebra -

    if you rearrange things a bit, you see

    x^3-100x + x^2-100
    = x(x^2-100) + 1(x^2-100)
    = (x+1)(x^2-100)
    = (x+1)(x-10)(x+10)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    You have two formulas to use: A = lw -->area = length times width P = 2l + 2w -->perimeter You know the perimeter, which is 200m of fencing. Let length = x Now let's solve the perimeter equation for w, using what we know: 200 …
  2. Business

    In planning a new item, a manufactuer assumes that the number of items produced x and the cost of dollars C of producing these items are related by a linear equation, Projections are that 100 items will cost $22,000 to produce. Find …
  3. I need someone to check this

    Add and Simplify: 100x/x+10 + x^3/x+10 I have the answer as X^3+100x/X+10 is this correct?
  4. College algebra

    I need help finding an equation of the line containg (-5,-9)and (-2,-7) the answer has to be in slope-intercept form y=?
  5. algebra

    In finding distance problems i understand the use of formula of d/rt then what i do not understand is the giving solutions in 3 decimal places. Can someone give an example step by step?
  6. Math

    I need help with finding an equation to a line. Its finding an equation with the intercepts x=-1 and y=3. Ive gotten the slope of -3 but i don't know where to go from there......
  7. college algebra

    graph the function and state the vertex axis of symmetry, the intercepts, if any: f(x)=x^2-8x+15 Please show work so i can understand this. thank you
  8. College Algebra

    Suppose that the Quadratic equation had two X-intercepts. How could you use the intercepts to find the vertex?
  9. 6th grade math

    Hi.. i'm a little confused on using proprtion equations to solve percent problem. can you check the following?
  10. college algebra

    Need help in finding all vertical, horizontal, and slant asymptotes, x- and y-intercepts, and symmetries of f(x)=(x-3)/(x-4)

More Similar Questions

Post a New Question