Year 12s: what will be the first way you research your future options? >>

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What was that on the log question about just solving mathematically or graphically?

Graphically means using a graphing calculator to read off the value of the exponential.

Numerically means by finding it using trial and error (some students do this if they have no clue)

Reply 121

jonny5263

W h a t w a s t h e 1st p a r t o f l o g question...................................................
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Reply 122

AstarAstarA

Original post by civ1

yeah a really silly miststake. hiw many marks was the question. and how many will i lose do you think??

I think it was 4

Reply 123

swiftietay99

Original post by FakeDumbledore

Unlucky mate I've seen the official mark scheme and a few of these are wrong :/
Better luck next year in your resit...

what "official" mark scheme then? kindly enlighten us all.

Reply 124

NotNotBatman

Original post by 10moxoma

how do you rearrange in to find b in terms of a?

log_3{(3b+1)} -log_3{(a-2)} = -1

log_3{(\frac{3b+1}{a-2})} =-1

3^{-1} =\frac{3b+1}{a-2}

\frac{a-2}{3} =3b+1

a-2 =9b+3

b = \frac{a-5}{9}

Reply 125

civ1

Original post by AstarAstarA

I think it was 4

so how many will i lose??

Reply 126

edis1122

guys the equation of the tangent to the circle wasn't that 3y+5x-89=0

Reply 127

Chrisj725

Original post by AstarAstarA

Graphically means using a graphing calculator to read off the value of the exponential.

Numerically means by finding it using trial and error (some students do this if they have no clue)

Brilliant thank you, I answered it easily but thought I was missing something!

Put it on here then

Original post by NotNotBatman

log_3{(3b+1)} -log_3{(a-2)} = -1

log_3{(\frac{3b+1}{a-2})} =-1

3^{-1} =\frac{3b+1}{a-2}

\frac{a-2}{3} =3b+1

a-2 =9b+3

b = \frac{a-5}{9}

Where have you got this mark scheme from mate?

Reply 130

AstarAstarA

Original post by civ1

so how many will i lose??

It depends on whether they will allow follow through marks. They decide on the mark scheme after they get the results back to see where most students slipped up. If a lot of students make a particular mistake, then they will adjust the mark scheme to allow some non dependent marks and error carried forward answer marks. However, people found this paper quite easy so it's unlikely that they'll be generous.