help idk how they got this

[lapis hatch]

It’s just where the lines intersect

[true pebble]

but like how do i plot the equations and solve it

[true pebble]

how do u plot the first one for example

[stiff maple]

For x² + y² = 9 you find the radius which is sqrt(9) = 3, then find the centre which in this case is (0,0) and just draw a circle of radius 3 from the point (0,0)

[true pebble]

ohhhh i see

also for this question why did they cube the scale factor i thought it was just for volume not mass

[stiff maple]

mass = volume × density

The density doesn't change because it's all made of clay

So when they have a length sf, the volume is multiplied by sf³ meaning the mass has to be multiplied by sf³

[true pebble]

ohhh

[stiff maple]

So yeah it's normally for volume but you can do it for mass if they're made of the same thing

[true pebble]

okay thanks

also for the first question how did they get the solutions?

[stiff maple]

They read from the graph

Well the ones they drew

[true pebble]

idk how they got it

what are they looking at

[stiff maple]

They drew the graphs, they're looking at where the line and circle meet and finding those coordinates

[true pebble]

ohhh

i seee

thank you

idk why it took me so long to get

[true pebble]

I’m trying to do the quadratic formula and it keeps saying maths error but this is what I typed in

[vagrant cypress]

the square root is wrongh

shouldnt be <0

[stiff maple]

Either you didn't put it in properly or there's no real roots

[vagrant cypress]

yo

does the differntiation ever get this long in the exam

[true pebble]

That was the question

I thought initially I could factorise but then I realised it was the quadratic formula

[vagrant cypress]

when u do the x6 method

the quadratic formula doesnt work

[true pebble]

Yh i didn’t include that in the equation

[vagrant cypress]

oh

also

[true pebble]

That’s what I did

[vagrant cypress]

b = -3

so it should be 3 not -3 at the front

[true pebble]

Ohhhh

[vagrant cypress]

amnd

c = -4

not 4

[true pebble]

I thought it was always negative b

[vagrant cypress]

it is

-(b)

-(-3)

[true pebble]

Ohhhhh

I seee

Thank you

[vagrant cypress]

and c = -4

so it should be

(-3)^2 -4(6)(-4)