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Re: Set a boring maths challenge for the person below...

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lucky908 is not online. lucky908
Joined: 01 May 2011
Total Posts: 1137
17 May 2015 06:44 AM
Let me go first...

What is x if 9x+5-3=37?
(Pretty easy)



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Porks is not online. Porks
Joined: 19 Sep 2012
Total Posts: 1504
17 May 2015 07:02 AM
"What is x if 9x+5-3=37?"

9x + 5 - 3 = 37
<=> 9x = 37 - 5 + 3
<=> 9x = 35
<=> x = 35/9 = 3 + 8/9


Now for something a bit harder:

5 + 2cos(x + 0.25π) = 7

solve eit

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redlego98 is not online. redlego98
Joined: 11 Jul 2008
Total Posts: 8870
17 May 2015 07:14 AM
5 + 2cos(x + 0.25π) = 7
2 cos (x+ 0.25π) = 2
cos(x+ 0.25π) = 1
x+ 0.25π = 0
x = - 0.25π


Here is an easy one if you know what you are doing.

h(x) = {-2x² + 5x +10 for -4 ≤ x < 3 }
{2x + 3p for 3 ≤ x ≤ 5 }

For what value of p will the function be continuous?


My name is Michael J. Caboose, and I hate babies!
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Porks is not online. Porks
Joined: 19 Sep 2012
Total Posts: 1504
17 May 2015 08:07 AM
"5 + 2cos(x + 0.25π) = 7
2 cos (x+ 0.25π) = 2
cos(x+ 0.25π) = 1
x+ 0.25π = 0
x = - 0.25π"

Nope.

You went wrong at the fourth line. It should be:

cos(x + 0.25π) = 1
<=> x + 0.25π = k * 2π
<=> x = -0.25π + k * 2π

Remember that the cosine function is a wave and therefore it keeps... well... waving.


"Go to hell, Aard" ~b0ddyp3n | Aard's alt, add 10k posts
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redlego98 is not online. redlego98
Joined: 11 Jul 2008
Total Posts: 8870
17 May 2015 02:16 PM
Are you sure? I had plugged my answer in and I got 7.

My name is Michael J. Caboose, and I hate babies!
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rellycoolistkirby is online. rellycoolistkirby
Joined: 03 Mar 2012
Total Posts: 8032
17 May 2015 02:16 PM
9+10.
(sorry about that.)
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R1NGLEADER is not online. R1NGLEADER
Joined: 30 Jul 2013
Total Posts: 2411
17 May 2015 02:18 PM
is this algebra 2 cuz ive never seen cosine in an equation/expression
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0leeoX is not online. 0leeoX
Joined: 03 Apr 2015
Total Posts: 7714
17 May 2015 02:21 PM
[ Content Deleted ]
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redlego98 is not online. redlego98
Joined: 11 Jul 2008
Total Posts: 8870
17 May 2015 02:21 PM
5 + 2cos(x + 0.25π) = 7
5 + 2cos(-0.25π+0.25π) = 7
5 + 2 cos (0) = 7
5 + 2*1 = 7
7 = 7

Just proof of concept.

My name is Michael J. Caboose, and I hate babies!
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CulturedBoomber is not online. CulturedBoomber
Joined: 17 Jun 2012
Total Posts: 1297
17 May 2015 02:22 PM
stop remembering i have school tomorrow
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R1NGLEADER is not online. R1NGLEADER
Joined: 30 Jul 2013
Total Posts: 2411
17 May 2015 02:23 PM
someone answer me
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redlego98 is not online. redlego98
Joined: 11 Jul 2008
Total Posts: 8870
17 May 2015 02:24 PM
It is Algebra 2, yes. That or pre-calc.

My name is Michael J. Caboose, and I hate babies!
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