Question

4x^2-29x+7=0??

Answer 1

do you know the quadratic formula ?

Answer 2

no, I usually complete the square.

Answer 3

I need to solve it using completing the square.

Answer 4

So first you wld multiply a*c which is 4*7=28
Then we need to find two numbers that when you add them equal b=-29 and when you multiply it it equals A*C=28
So the 2 numbers wld be -1 and -28
-1*-28=28
-1-28=-29

Answer 5

ohhh sorry i didnt realize that

Answer 6

wait nearly finished solving it give me one more sec

Answer 7

kkk i figured it out but it is sooooo ugly

Answer 8

f(x)=4(x-(29/8))^2-(729/16)

Answer 9

okkk ill show u the steps now if u wld like

Answer 10

no I am here

Answer 11

ok so the first step is to kind of separate the number with the x^2 and the x leaving the 7 alone and out of the bracket
f(x)=4(x^2-(29/4)x)+7

Answer 12

next we take our middle termwhich -(29/4) and we divide it by 2 and then square it
(29/4)/2=(29/8)
(29/8)^2=841/64
f(x)=4(x^2-(29/4)x+(841/64))+7
Now we know that whtvr we do to one side you have to do to the other. So since we added 4(841/64) to one side we have to add it to the other side
f(x)+4(841/64)=4(x^2-(29/4)x+(841/64))+7
f(x)=4(x^2-(29/4)x+(841/64))+7-(4*(841/64))
f(x)=4(x^2-(29/4)x+(841/64))-(729/16)

Answer 13

ok the last step is to take the middle bracket and "complete the square"
Wld u by any chance know how to do that?

Answer 14

ok well i tell u what to do in this case so u will know what to do next time
you take the midlle term that u divided by two which was
(29/4)/2=29/8
that term when squared = (841/64) and when added twice equals (29/4)
Remember we leave the sign that it had originally which was a negative
f(x)=4(x-(29/8))^2-(729/16)
I may have confused u along the way but in general u dont have to understand the logic you just have to follow a set of rules. wait let me see if i can find u a link to the set of steps that u have to follow

Answer 15

http://www.mathsisfun.com/algebra/completing-square.html
ok I like this one and they solved it in an easier way than i did lol
scroll down to the bottom and like ull see this highlighted peach box and like there they give u the steps like its very easy too follow