My question is 2x-4x=5 (solve use the quadratic formula. approximate the solutions to the nearest tenth.
I got 4 +or- radical 56 over 4
Now what?
Thanks a bunch to all who help.
2007-05-22 13:02:12 · 3 answers · asked by Jessie 1 in Science & Mathematics ➔ Mathematics
Could question be:-
2x² - 4x - 5 = 0
x = [ 4 ± √(16 + 40) ] / 4
x = [ 4 ± √(56) ] / 4
x = [ 4 ± 2√(14) ] / 4
x = 1 ± (1/2).√14
2007-05-22 20:31:40 · answer #1 · answered by Como 7 · 0⤊ 0⤋
Now you'll just have to use a calculator. Any scientific will do; your computer probably has one built in.
The key entries will probably go something like this:
[5] [6] [â] [=] [+] [4] [=] [/] [4] will give you one answer
[5] [6] [â] [=] [+/-] [+] [4] [=] [/] [4] will give you the other; that [+/-] is a sign changer. You probably know all this if you're using the quadratic formula, anyway, but I'm just making sure.
2007-05-22 20:12:06 · answer #2 · answered by YCZ6 2 · 0⤊ 0⤋
2x-4x=5 is not a quadratic equation. The solution is
-2x=5
x=-2.5
I assume you miss typed something. If you send me the correct equation, I'll solve it for you.
2007-05-22 20:07:44 · answer #3 · answered by yupchagee 7 · 0⤊ 0⤋