xy = -4
therefore 2xy = -8 (2yx = -8)

sub in the second equation i.e.

x(x + 6) = -8
x^2 + 6x = -8
x^2 + 6x + 8 = 0 (and solve as a quadratic)

:smile:

Reply 6

Sophie Maywood

OP

Ok but on the second equation, how did you obtain the -8

Reply 7

Moronic Acid

11

Sophie Maywood

Ok but on the second equation, how did you obtain the -8

xy = -4

multiply both sides by 2

2 x (xy) = 2xy

2 x -4 = -8

Reply 8

Moronic Acid

11

i just looked at your profile (OP) and i cannot believe that you wouldnt know how to do this

your not a troll by any chance are you? :p:

Reply 9

Sophie Maywood

OP

no- this is the only part of maths where I get stuck- anyway what's a troll? :smile:

Reply 10

Moronic Acid

11

Sophie Maywood

no- this is the only part of maths where I get stuck- anyway what's a troll? :smile:

yeah but this is unbelievably easy (as in the only thing easier than this is just addition and multiplication - and subtraction and division lol)

a troll is generally someone who posts really gay stuff/starts pointless threads just with the intent of annoying people (which im sure youre not :biggrin:

)

Reply 11

username167718

4

Sophie Maywood

no- this is the only part of maths where I get stuck

You're a further maths student, and cannot solve a simple quadratic equation? That's a bit hard to believe, but whatever :p:

tomthecool

You're a further maths student, and cannot solve a simple quadratic equation? That's a bit hard to believe, but whatever :p:

Not so hard to believe actually. Earlier this week I was teaching Mechanics 1 to a UK born-and-bred Year 12 mathematician with a string of A* GCSE grades (including maths and english).

The conversation went like this. "I can't do this question because I don't know the difference between push and pull. I know what they mean but I don't know which one is which."

"So what do you do when you meet a door that has PUSH written on it?"

"I try both things. It works out OK half the time."

Reply 13

Moronic Acid

11

Mr M

Not so hard to believe actually. Earlier this week I was teaching Mechanics 1 to a UK born-and-bred Year 12 mathematician with a string of A* GCSE grades (including maths and english).

The conversation went like this. "I can't do this question because I don't know the difference between push and pull. I know what they mean but I don't know which one is which."

"So what do you do when you meet a door that has PUSH written on it?"

"I try both things. It works out OK half the time."

That sounds like a sarcastic joke mate (by your student- not you lol)

Reply 14

Swayum

18

Mr M

The conversation went like this. "I can't do this question because I don't know the difference between push and pull. I know what they mean but I don't know which one is which."

"So what do you do when you meet a door that has PUSH written on it?"

"I try both things. It works out OK half the time."

I admit I often don't understand obvious concepts in mechanics even when it's not technical terminology but the above is just hilarious.

Reply 15

username167718

4

Mr M

Not so hard to believe actually. Earlier this week I was teaching Mechanics 1 to a UK born-and-bred Year 12 mathematician with a string of A* GCSE grades (including maths and english).

The conversation went like this. "I can't do this question because I don't know the difference between push and pull. I know what they mean but I don't know which one is which."

"So what do you do when you meet a door that has PUSH written on it?"

"I try both things. It works out OK half the time."