math..solve for u again.

posted by .

u-2√2=3. please show work

  • math..solve for u again. -

    What part of my work don't you understand?

    u - √2 = 3

    u - 1.414 = 3

    u = 4.414

  • math..solve for u again. -

    the answer should be 9

  • math..solve for u again. -

    sorry. u-2√u=3

  • yes, 9 is right -

    let x = sqrt u
    then
    x^2 - 2 x = 3
    x^2 - 2 x - 3 = -
    (x-3)(x+1) = 0
    x = 3 or x = -1
    try sqrt u = 3 then u = 9
    9 - 6 = 3 Yes
    try sqrt u = -3 , that is an imaginary number, forget it
    so
    u = 9

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    Find an equation of the line that bisects the obtuse angles formed by the lines with equations 3x-y=1 and x+y=-2. a. (3√2 +√10)x-(√10 + √2)y-2√10+√2=0 b. (3√2 - √10)x+(√10 - √2)y+2√10+√2=0 …
  2. mat115

    Please help me with this math question. I am asked to show my work but I don't know how to solve the problem to show my work. The question is: Choose the correct list of factors of the number 8. Again, I have to show my work with this …
  3. math grade 11

    i need help with this quretsion ; i don't know if im right, and i dontknwo what do next question expand and simplfy: 4√7(2√3 + 3√6 - √7) my work = 8√21 + 12√42 -4√49 please help me
  4. math grade 11

    i need help with this quretsion ; i don't know if im right, and i dontknwo what do next question expand and simplfy: 4√7(2√3 + 3√6 - √7) my work = 8√21 + 12√42 -4√49 please help me
  5. maths

    I will be thankfull to you if you help me to solve the below problem: 6√x-11/3√x=2√x+1/√x+6 I tried to solve the above problem like this: (6√x-11)(√x+6)=(3√x)(2√x+1) 6√x(√x+6)-11(√x+6)=(3√x)(2√x)+(3√x)(1) …
  6. Math - Help with radicals please

    Please show work Simplify rational 1. 4√(a^6 b^13) / 4√(a^2b) 2.√(2x^3 / 49y^4) Add or Subtract 3. x√(75xy) - √(27x^3y) Multiply 4.(√(5) - 5) (2√(5) + 2) Rationalize the denominator 5. √(25x^5 …
  7. math

    I am not sure how to do these. 1. Simplify 4√6/√30 by rationalizing the denominator. Show your work. 2. Simplify (2√5 + 3√7)^2 Show your work. Justify each step.
  8. math

    I just want to see if my answers are correct and if no, can you please show your work and explain how to do it?
  9. math

    I just want to see if my answers are correct and if no, can you please show your work and explain how to do it?
  10. Algebra - Check My Work

    For Question 1-8 Simplify the Radical Expression *** - My Answer 1.√45 3√5*** 2.√180x^2 6x√5*** 3.√150x^3 k^4 5xk^2√6x*** 4.√21y * 5√49y 35y√21*** 5.(The square root sign applies …

More Similar Questions