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Maths GCSE exam question thread

i'm making this thread in hopes of getting help on questions i find difficult on past papers, i will be bumping this everytime i find a question hard to understand, so please help out if you can :smile:

my non-calc is on wednesday and calc is on tuesday next week. the faster the help, the better :smile:

the first question is silly but i honestly have no idea what else it wants :/

''solve y^2=49''
you must write down all possible solutions

it's worth 2 marks, what is the other mark?

Scroll to see replies

Reply 1

Kevin De Bruyne

There are two solutions.

Reply 2

username1567177

you need to work out the value of y and because y is squared which equals 49 to find y which is the oppopsite way of solving the equation you do the square root of 49 which is 7 so y=7.

Hope that helps
(i think it's right)
:smile:

Reply 3

username1567177

Original post by SeanFM

There are two solutions.

Is it y=7 or y=-7 ? because -7 squared makes positive 49

Reply 4

Kevin De Bruyne

Original post by xGCSE_Studentx

Is it y=7 or y=-7 ? because -7 squared makes positive 49

Both

Reply 5

username1567177

Original post by SeanFM

Both

Yay! i'm happy i got it right algebra's like the only thing i can do in maths :frown:

Reply 6

TSR George

Original post by xGCSE_Studentx

Is it y=7 or y=-7 ? because -7 squared makes positive 49

see this is why i feel like i will make silly mistakes, i didnt even give the negatives a thought :frown:

Reply 7

username1567177

tbh i didn't either until seanFM mentioned that but dw when you check your paper always read what the question asks for - i'm not the best person to ask about maths though :frown:

Reply 8

jamestg

Every mistake now that is overcome, is one mistake less in the exam!

Reply 9

TSR George

Original post by jamestg

Every mistake now that is overcome, is one mistake less in the exam!

hopefully i can keep those in mind, it might just go out the other ear lol

Reply 10

jamestg

Just work on those mistakes. If you don't work on them, you won't improve.

Constantly getting minus numbers wrong? Who cares you're in Y11?! Watch a video and do questions on them. Still cancelling algebraic fractions incorrectly, re learn the stuff and try again. YOU'VE GOT SO MUCH TIME TO IMPROVE BETWEEN NOW AND JUNE - USE IT WISELY!

Spoiler

Reply 11

TSR George

Bump

find the integer that satisfies the equation x^3 - 2x = 21
show all your workings

i've never even gone through solving equations like this before where there's two unknown values T_T

Reply 12

Megan_101

Oh wait, my bad didn't read the question properly

(edited 8 years ago)

Reply 13

TSR George

Original post by Megan_101

Factor theorem? :biggrin:

sorry that is definitely not on my specification :redface:

is there anyway around it? a more simpler way? it was on 2014's wjec paper so the specification definitely should still be the same as now

Reply 14

Megan_101

You could keep substituting values in for x until you get the right answer? It's pretty obvious when you think of it like that

Reply 15

TSR George

Original post by jamestg

Spoiler

im so jelly of you, that is sooo good, but honestly, i really want to just end it this november, i dont want another two exams on top of the summers one :3

Reply 16

TSR George

Original post by Megan_101

You could keep substituting values in for x until you get the right answer? It's pretty obvious when you think of it like that

will they not penalise you for that? i thought it would be more mathematical :smile:

but thanks!

Reply 17

Megan_101

Sorry, ignore that comment, didn't read the question properly :colondollar:

Reply 18

jamestg

That really sucks, I really wanted to do it in november too but I obviously couldn't.

Honestly, if you work really really hard between now and the exam, you won't need to revise maths during the exam season :smile:

(I didn't during exam season, I just made sure that before exams started I understood everything and could answer pretty much any question!)