math, algebra

How can i solve for this would it best to factor or use the quadratic formula.

solve: x^2+2x-8=0

How about for this problem as well:

solve : x^2+7x-1 = 0









in the first, can you think of two multipliers of -8 that have a sum of 2??
how about 4 and -2
so it factors!

in the second, are there any factors of -1 that have a sum of 7????
not very likely, so use the formula

  1. 👍 0
  2. 👎 0
  3. 👁 79

Respond to this Question

First Name

Your Response

Similar Questions

  1. math

    solve the equation x^3-5x^2-4x+20=0 I need a hint on how to solve this Look for the first root by graphical means or trial-and-error. Note that when x=2, x^3-5x^2-4x+20 = 8-20 -8 +20 = 0. Therefore 2 is one root and x-2 is a

    asked by jason on July 8, 2007
  2. math,algebra

    can someone help me out factor out this 0=16t^2-122t+180 i have so far this but the last one i am not sure 8(2t^2-14t + ?) you need to use the quadratic formula: -b(+or-)[sqrt(b^2-4ac)/2a] so you are saying that i don't have to

    asked by jasmin20 on April 6, 2007
  3. Algebra

    Factor quadratic expressions: 2x^2 + 9x + 4 10x^2 + 70x + 100 Solve quadratic equations by factoring: 2x^2 + 9x + 4 = 0 Solve by taking square roots: (x - 5)^2 - 81 = 0

    asked by Casey on June 10, 2015
  4. Math 3

    Solve by factoring: One of the solutions to the quadratic equation x^2 - 13x + 30 is 3. What is the other solution? Is it:(x+3) If 3 is a solution, then the quadratic contains a factor (x-3). The other factor is thus (x-10), and

    asked by Margie on January 30, 2007
  5. algebra

    solve the polynomial y=2x^2-4x+1 For Further Reading algebra - Reiny, Thursday, May 17, 2007 at 10:34pm I am sure neither your text nor your teacher asked you to "solve the polynomial y=2x^2-4x+1 " are you graphing the function,

    asked by Haylee on May 18, 2007
  6. Math

    -x^3 + 1.85x^2 - x +0.15 = 0 how can you solve for x? An exact solution or a numerical solution? Exact solutions can be obtained as follows: x^3 - 1.85x^2 + x - 0.15 = 0 First get rid of the quadratic term by substituting: x = (y

    asked by JV on July 10, 2007
  7. polynomials

    i also have theses to solve Factor the polynomial x2 + 5x + 6 completely Solve the given equation by using the quadratic formula. x2 – 7x – 4 = 0 What value is under the square root (or radical) in your answer? (Note: You are

    asked by mike on May 15, 2007
  8. Math

    How can I find the point of intersection of the graphs x^2=y=4 and 2x-y=1 by hand? I can do the problem using a calculator, but I don't know how to do it by hand. I tried using substitution, but I ending up getting x^2+2x-5=0. It

    asked by Corin on June 28, 2007
  9. algebra

    Why are there two solutions in the quadratic equation and Why do you factor a quadratic equation before you solve it

    asked by jenn on June 21, 2005
  10. Algebra2

    Find the polynomials roots to each of the following problems: #1) x^2+3x+1 #2) x^2+4x+3=0 #3) -2x^2+4x-5 #3 is not an equation. Dod you omit "= 0" at the end? #2 can be factored into (x+1)(x+3) = 0, so the roots are x=-1 and -3.

    asked by Haylee on May 13, 2007
  11. algebra

    solve for x (24+2x)(10+2x) - 240 = 152 First multiply. 24(10) = ___ 2x (2x) = ____ Now subtract 240. Can you finish the problem from here? dont i need to put this in equatic equation to solve for x. cause i need to find the width

    asked by q on August 3, 2007

More Similar Questions