I'm just not really confident in matrices, circle graph and sin graphs etc and would appreciate if you can explain and teach me. Is okay if not. Thank u.
#Would someone be able to have a whole walk through of this worksheet with me please? (non calculate)
quick timber
heady umbraBOT
quick timber
Hello
quick timber
plz help
nimble light
hey, you still need help ?
random kite
nimble light
What kind of help do you need with on 3,7,10 ? Having trouble to start or trouble at a given point?
quick timber
I dont really understand the question
nimble light
The three of em ?
quick timber
yeah
nimble light
Well for 3. you are given the equation of a line and 2 points of which the coordinates can be deduced from said line equation, then you have to calculate the length from A to B
In the 7. you have a graph of a function and are asked to give its expression
on 10 I assume you would need to find the x-intercept and y-intercept, plus vertex perhaps and sketch the curve as precisely as you can by hand
quick timber
what is intersection mean on Q10?
nimble light
I suppose by intersection they mean same as the intersections asked on the 7, i.e. the x and y interceptions
mb mb 3 not 7
same as on 3 not the 7
quick timber
so i need to put both the interceptions of x and y when they equal 0?
nimble light
yeah you need to include the points (0,f(0)) and (f^(-1)(0), 0) to have a more precise sketch
and I think the vertex at -b/2a too
quick timber
For Q3, I think from the question it says A is y=0 and B is when x=0 so I need to sub these values in the equation to find the coordinates?
nimble light
yup
quick timber
ok
nimble light
yeah in parabolas
quick timber
thank you
nimble light
np
quick timber
In the 7. you have a graph of a function and are asked to give its expression
how do i do it when it look like this, is not a curve or straight line?
nimble light
piece wise means a function that is defined piece by piece, you can say: for all x in [x0,x1], f(x) = ... and for all x in [x2, x3], f(x) = ....
on the image you can for example split it into two domains and define it in two pieces by lines
nimble light
yeah such functions can actually be quite interesting too
quick timber
I'm not sure how to lay out the ans, I got for 2<_ x<_1, f(x)=2 and I don't know how to write the domain of x in the middle part in inequalities, like i don't know if it is (bigger than )or ( bigger than or equal )
bc up to 1 is still stationary, and the 2nd line begins after 1?
nimble light
well bigger than or bigger than or equal would fully depend on whether the point is included or isn't. Now in your case there is no empty circle on the curve to denote the point isn't part of the curve so I would assume it belongs to the curve
well on this graph, without explicit conventions given, I would assume you can give the point to either of them
though perhaps not both at once
quick timber
okay
nimble light
if by <_ you denoted less than or equal then you'd have to do a simple greater than 1 for the second piece to avoid conflict
quick timber
okay how about when x=4, the same?
nimble light
oh yes
nimble light
yeah
quick timber
calculator
nimble light
yeah no calculator I think since they say "sketch" so yeah quad formula and get vertex, x and y intercepts