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Edexcel GCSE maths, give each other questions to do.

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Ahh I see... just a misunderstanding.

For some stupid reason I thought you rooted the power of 10 instead of the whole calculation.

So 2^10 = 1024

and square root 1024 to get 32 which is 2^5

oh right then :smile:

Reply 141

username2174765

Original post by BTAnonymous

I still don't understand how you got from:

\left(\dfrac{2^{-3x}}{2^{-2}}\right)^2=2^{10}

\dfrac{2^{-3x}}{2^{-2}}=2^5

Like the other guy said, why don't you square root 10 but instead divide it by 2?

Basically 2^10 is equal to 1024, when you square root 2^10 you're square rooting 1024 which can be written as 32 or 2^5.

Hope this makes more sense

Reply 142

Ano123

Original post by Ano123

Here's a question.
Find the value of

x

such that

\displaystyle \left (\frac{2}{3} \right )^{x-1} = \left ( \frac{9}{4} \right )^{x+2}

Any takers?

Reply 143

ihatehannah

Original post by Ano123

Any takers?

x= -1?

Reply 144

jessyjellytot14

If you want a challenge, there is some C1 content that overlaps some of the A* Gcse topics.

http://www.physicsandmathstutor.com/maths-revision/a-level-core-1/solomon-worksheets/

Only the algebra, coordinate geometry and graphs of functions sheets will be relevant and some parts you may not know how to do but it should be helpful! :smile:

Reply 145

Ano123

Original post by ihatehannah

x= -1?

Good.
Must have been too easy.
What are considered the most difficult GCSE topics?

Reply 146

ihatehannah

Original post by Ano123

Good.
Must have been too easy.
What are considered the most difficult GCSE topics?

it's not the topics that are difficult, it's the problem solving aspect of the topics that they give like the hannah's sweets question.

Reply 147

EnglishMuon

Heres a simple idea with a nice solution: Let

S

be the set of all 2x2 matrices of the form

\mathbf{M}= \begin{pmatrix} a & b \\c & d \end{pmatrix}

such that the elements a,b,c,d form an arithmetic series. Find all matrices

\mathbf{M}

such that

\mathbf{M}^{k}

is also an element of S.

Reply 148

mayjunemayhem

ImageUploadedByStudent Room1463856503.072089.jpg

ImageUploadedByStudent Room1463856516.609108.jpg

ImageUploadedByStudent Room1463856526.313857.jpg

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Reply 149

mayjunemayhem

Those are a* questions so try it. They're non calculator aswell

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Reply 150

Ano123

Original post by mayjunemayhem

Those are a* questions so try it. They're non calculator aswell

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I can't see why you'd even need a calculator.

Reply 151

okey

Original post by Ano123

I can't see why you'd even need a calculator.

how do you solve your question

Reply 152

JamieGre

Original post by mayjunemayhem

Those are a* questions so try it. They're non calculator aswell

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6√2 for question 21?

(edited 7 years ago)

Reply 153

mayjunemayhem

I got the questions from November 2011 that papers good for practice. Check for the solutions

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Reply 154

Ninestars

Original post by mayjunemayhem

Those are a* questions so try it. They're non calculator aswell

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i got k = 6

Reply 155

Ano123

Original post by okey

how do you solve your question

Which question?

Reply 156

Gooner4life1

what mark do we need for an A for GCSE Edexcel maths

Reply 157

mayjunemayhem

Original post by Gooner4life1

what mark do we need for an A for GCSE Edexcel maths

To be on the safe side of an A you'll need about roughly 65/100 per paper. But really it depends on how both the calculator and non calculator papers are as the grade is based on what you get in both papers which is out of 200.

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