Algebra

posted by .

i forgot how to solve these types of problems..

2x^2-18x=0, x^2=6x+7, 6y^2+5y-6=0

Also
SOLVE FOR X CORRECT TO 4 DECIMAL PLACES:

x^2+6x+2=0 2x+4=3x^2

  • Algebra -

    For the first bit of the question, get all the terms over onto the left-hand side of the equation. For example, take the second one:

    X²-6X-7=0

    Usually you can factorize it easily into the following form: (X+A)(X+B). (There's no guarantee that it's an easy factorization, but if you're expected to solve it this way it usually is.)

    If you multiply out those two brackets, you'll get X² + (A+B)X + AB.

    So in this example, if you compare the corresponding terms from the two equations, A + B = -6 and AB = -7. So what are A and B? Usually you can spot it in a few seconds...

    How about A = 1 and B = -7?
    One down, two to go...

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    thanks for the answers, but I need to know how to solve the problems, so I can finish the remainder of my homework. Use a power of ten to change each to a decimal. 2 1/2 4 1/25 I need to learn how to solve these types of problems. …
  2. math,bobpursley

    Is this the correct way to solve these math problems and are the answers correct. Directions:Solve the following applications. Science. Jose rode his trail bike for 10miles. Two-thirds of the distance was over a mountain trail. How …
  3. Math

    i forgot how to solve problems like this... 2x^2-18x=0, x^2=6x+7, 6y^2+5y-6=0 also I need help on this one SOLVE FOR X CORRECT TO 4 DECIMAL PLACES x^2+6x+2=0 2x+4=3x^2
  4. algebra

    Give exact and approximate solutions to three decimal places x^2+18x+81=1
  5. algebra

    give exact and approximate solutions to three decimal places for x^2+18x+81=49
  6. algebra 2

    Solve the equation for x. Round your answer to two decimal places. Do not include "x =" in your answer. ln(e^18x) = 9
  7. Math

    Solve the exponential equation. Use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution. 7^4x = 4.9
  8. Algebra 1

    What is 28% as a decimal and as a fraction?
  9. math

    What types of problems can be solve using the gcf?
  10. fifth grade math

    How many decimal places are in the product of a number with decimal places to the hundredths multiplied by a number with decimal places to the tenths?

More Similar Questions