GCSE simultaneous equation

aura1947

Bullit

Yes but I'm asking about using the quadratic formula since that should still give me the correct answer.

Never mind, this isn't going anywhere.

Did you even look at samir12's post?

Reply 21

Bullit

OP

Yes I've looked at all the posts.

I've worked it out now anyway.

Reply 22

samir12

16

Yeah you made the mistake when you forgot to make 8 a positive, -(-8) this is what you should have done when using the formula , be careful as you have to take the negatives of ax^2 + bx + c into account, so if it was ax^2 - bx + c, in the formula you should put -(-b)... instead of simply -b

Reply 23

Bullit

OP

samir12

Yeah you made the mistake when you forgot to make 8 a positive, -(-8) this is what you should have done when using the formula , be careful as you have to take the negatives of ax^2 + bx + c into account, so if it was ax^2 - bx + c, in the formula you should put -(-b)... instead of simply -b

Yes, that is exactly what I did wrong. I just need to be more careful in the exam.

Reply 24

filla7

1

the answer is when x= -1.4 or -7/5 , then y= -4.8
OR
when x=3 then y =4

that is the right answer whether you use quadratic formula or factorisation you should get this answer.

GCSE simultaneous equation

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