Question

ill medal & fan :)

Answer 1

0 = –16t2 + 36t + 4.

Answer 2

set
\[-16^2+36t+4=0\] and solve
but i would do some simple algebra first

Answer 3

thanks!

Answer 4

Anytime.

Answer 5

divide all by \(-4\) and solve
\[4x^2-9x-1=0\]

Answer 6

can you help me with this one?

Answer 7

that way the arithmetic will be easier when you use the quadratic formula
the numbers are smaller

Answer 8

\[2x^2-8x+7=0\] is the first step

Answer 9

then one more time it is
\[x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\] with
\[a=2,b=-8,c=7\]

Answer 10

okay! which of the above do you think is the answer

Answer 11

i don't know i didn't do it
hold on

Answer 12

ok!

Answer 13

i get \[2\pm\frac{\sqrt2}{2}\] lets see whichone we can match it up with

Answer 14

oh, that is already one answer
ok go with that one

Answer 15

THANKS:) i have two more questions:/ could you help mee?

Answer 16

sure

Answer 17

lets try this
\[x^2+6x=-7\\
(x+3)^2=-7+9=2\\
x+3=\pm\sqrt2\\
x=-3\pm\sqrt2\]

Answer 18

that method is called "completing the square" as in turn \(x^2+6x\) in to a perfect square by adding \(9\) to both sides, making the left \((x+3)^2\) and the right \(-7+3^2\)

Answer 19

okay! thanks.

Answer 20

yw

Answer 21

one more!

Answer 22

oh good

Answer 23

\[x^2-7x+5=0\] etc

Answer 24

since \(-b\) is \(7\) you can ignore C and D

Answer 25

in this case \(b^2-4ac=49-20=29\) i would go with B

Answer 26

thank you so much. :)

Answer 27

yw
why math on xmas eve??