Question

what is the checking for completing the square ?? hao it is ??? please help me ! :((

Answer 1

this is the problem ..
what are the zeros of f(x)= 2x(squared) - 5x + 1

Answer 2

its the process of rearranging a trinomial so that it contains a perfect square for example
x^2 + 4x - 1
= (x + 2)^2 -2^2 - 1
= (x + 2)^2 - 5

Answer 3

i already get the correct answer my problem is the checking . :((

Answer 4

Substitute your answers back into the original equation and see if it is 0

Answer 5

but how ??

Answer 6

help me please ?? :(

Answer 7

for checking you just substitute the values you got.. what did you get as your answer?

Answer 8

tine??????

Answer 9

the first one is the square root of 17/16 . that is from the first equation.. the second one is the value of x . it is x=5(square root)17/4.... and the third one is x= -1/5 ... :)

Answer 10

Equation is a quadratic, there are 2 solutions.

Answer 11

sorry . it is x=5(square root)17/4 and x= -1/5 . :)

Answer 12

can you help me for this ??

Answer 13

Your original equation is 2x(squared) - 5x + 1

Let's take x= -1/5 ->

2(-1/5)^2 -5(-1/5) + 1 = 2/25 +1 +1 = 2 and 2/25 not 0 so this solution is wrong.

Answer 14

http://www.wolframalpha.com/input/?i=2x%28squared%29+-+5x+%2B+1

Answer 15

Completed square and solutions are there.

Answer 16

aww . how about if x=5(square root)17/4 is x=-5(square root)17/4 ???

Answer 17

The solutions at the link I gave u are

5/4 plus or minus (square root)17/4

Answer 18

how about if x=5(square root)17/4 is x=-5(square root)17/4 ??? can you solve it again ??? i think you can get the zero now. :(

Answer 19

please ?? if you dont mind. :)

Answer 20

The solutions are at the link I gave u and repeated above.

There is no point in checking wrong solutions, it is a waste of time, mine and yours.

Answer 21

ok ! thanks. :)