math

posted by .

i'm studying for a test and i've just got a few questions..
1-If x^2+8x+m has one double root then m=? and the vertex is?

2-I got -3-i(s.r)5 / 5 for this problem-> -15-(s.r)-125.. is that correct?

3-Is the answer for (5-3i)^2 -30i+ 16 ?

4-is the answer to the formula 25x^2-20x+1 in simplest radical form 2+/-(s.r)3/10?

  • math -

    1. If x^2 + 8x + m has a double root if it is a perfect square. Select a value of m that makes it one

    2. Is the problem to rewrite
    -15 - sqrt(-125)?
    If so, the two different expressions you wrote are not equal

    3. 25 -30i -9 = -30i + 16. yes

    4. You have written a polynomial expression but not an equation. Expressions can be rearranged but do not have "solutions". If you are looking for the soution to
    25x^2 -20x +1 = 0, what you wrote is not it. The first term would be 20/50 = 2/5

  • math -

    1. if there is a double root, then the curve must touch the x-axis, and the factors must be x-a)(x-a), where a is the contact value on the x-axis

    which means that x^2 + 8x + m must be a perfect square, looks like m has to be 16

    and the x-axis contact point would be (4,0)
    So what do you think about the vertex?

    2. Are you simplifying -15 - √-125 ?

    if so, then
    -15 - √-125
    = -15 -5√25*√-1
    = -15 - 25i

    were you trying to factor that? if so, then
    = -5(3 + 5i)

    3. ????

    4. your wording is horrible
    are you asking to solve 25x^2-20x+1 = 0 by the quadratic formula?

    then x = (20 ± √300)/50
    = (20 ± 10√3)/50
    = (2 ± √3)/5

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    what is the total number of electrons shared in a double covalent bond between two atoms, and why?
  2. Algebra

    I have a few questions that I am not too sure about, could you please check them. Thanks! 1. Find the union {2,3} U {2,4,8} This is what I got : {2,4,8,3} 2. State the name of the property illustrated: (6+3) +(1+16)=(1+16)+(6+3) I …
  3. chemistry/please double check

    Hi, I just need to know if I finally got this exercise right. Calculate the amount of heat in kilojoules released when 50 grams of steam at 125 Celsius are converted to 50 grams of ice at -125 Celsius. so, qw= 50*4.184J/g C (125 C-o)= …
  4. Math

    Linda got a math test handed back to her and got a 96% on it. However she lost the test, not knowing what she got. If she knows that she scored a 43 on the test then how many 1- mark questions are there on the test?
  5. Math-Calculus

    i have to questions that just need to be checked on to see if i got them right. Lim x-->infinity for both problems 10/x+10 is number one i got 0 for this one. or is it does not exist. lim x-->infinity 6x/6x+5 for this one I got …
  6. rational number math help

    compare use < > = 1) -4/9 - 1/4 i got -0.6 < -0.25 2) -1 -4/5 i got: -1 > -0.8 3) -7/8 -1/8 I GOT: -0.875 < -0.125 4) -1/3 -5/6 I GOT: -0.333 > -0.833 5) -2/5 - 1/10 i got: -0.4 < -0.1 6) -2/8 - 1/4 I GOT : -0.25 …
  7. powers of exponents math

    simplify each expression: can you check and help me please a) 3*3*3 i got: 27 b) (-2)(-2) i got: 4 c) (-125)(-125)(-125) i got: -1953125. d) -(2)(2)(2) i don't know: e) (-1) (-1) i got : 1 f) -4*4 i don't know:
  8. Math

    Mia took a test with 60 multiple-choice questions. Her teacher told her she got 88% correct. A.Write and solve a proportion to figure out how many questions she got correct.
  9. Maths

    In a test for every 6 answers carlene got correct, she got 2 wrong. She got 54 correct answers. 1 how many questions did the test have?
  10. Math 125

    I am enrolled in an online Math 125 class. I posted this question earlier in the week and never got a response, so here I am! I am just not understanding these questions. I made the tree diagram as suggested and put all the information …

More Similar Questions