Author Topic: yr 11 questions (Read 5203 times) Tweet Share

Hielly · « **Reply #15 on:** February 10, 2009, 04:42:56 pm »

omg flaming arrow, your a genius. It took me forever! Because when i found out x i just subbed it straight in equation 1, and then it gave me alot of pronumerals, that's what confused me. But now i know what to do, get rid of the x and then find y directly.

Flaming_Arrow · « **Reply #16 on:** February 10, 2009, 05:10:19 pm »

Quote from: Hielly on February 10, 2009, 04:42:56 pm

omg flaming arrow, your a genius. It took me forever! Because when i found out x i just subbed it straight in equation 1, and then it gave me alot of pronumerals, that's what confused me. But now i know what to do, get rid of the x and then find y directly.

yep thats the way.

Hielly · « **Reply #17 on:** February 24, 2009, 06:36:46 pm »

hey need help on this one

the amount of bending, Bmm, of a particular wooden beam under a load is given by B=0.2m^2 + 0.5m +2.5, where m kg is the mass (or load) on the end of the beam. what is the mass will produce a bend 8.8mm.

my equation is 8.8=0.2m^2 +0.5m +2.5
=0.2m^2 +0.5m-6.3

dont know what to do from here ( should i times them with 10 and then use completing the square?)

Flaming_Arrow · « **Reply #18 on:** February 24, 2009, 07:28:54 pm »

a= 2 b=5 c=-63

$\frac{-5 \pm \sqrt{25-4*2*-63}}{4}$

$\frac{-5 \pm \sqrt{529}}{4}$

$\frac{-5 \pm 23}{4}$

$x = \frac{9}{2} \ \mbox{or} \ x = -7$

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