Prelim. marathon? (1 Viewer)

[Shazer2]

I was wondering if people could post some prelim. questions for some practice.

 

[HeroicPandas]

Is this 2U maths?

 

[Shazer2]

Is this 2U maths?

Yeah prelim. 2U

 

[HeroicPandas]

Given the quadratic equation: x^2 + 6x - 2 = 0

Find α-β

 

[Shazer2]

Given the quadratic equation: x^2 + 6x - 2 = 0

Find α-β

We didn't cover that? Sorry.

 

[HeroicPandas]

We didn't cover that? Sorry.

So u haven't covered sum and product of roots?

Can u do α+β?

 

[Shazer2]

So u haven't covered sum and product of roots?

Can u do α+β?

No we haven't. We've covered:

• Linear Algebra
• Straight line graphing
• Calculus (differentiation)
• Geometry
• Trigonometry

..and probably a few more but I'll let you know if we haven't covered it.

 

[HeroicPandas]

No we haven't. We've covered:

• Linear Algebra
• Straight line graphing
• Calculus (differentiation)
• Geometry
• Trigonometry

..and probably a few more but I'll let you know if we haven't covered it.

ok, i will try to think of a hard question with those easy topics

 

[Shazer2]

Anyone else is welcome to post!

 

[Peeik]

Here you go:

P.s. Year 12 Extension kids are not encouraged to post their responses unless the prelim 2u students are stumped.

 

[Shazer2]

Here you go:

P.s. Year 12 Extension kids are not encouraged to post their responses unless the prelim 2u students are stumped.

We haven't done that either...

 

[nightweaver066]

If you cbb typing solution just type out the steps you did.

 

[Shazer2]

nightweaver066, that's a bit tricky, so far I've got to here and I'm stumped. Hint on what to do next?



EDIT: do I need to then do something like:



Then make the denominators common, or am I going down the wrong track here?

 

[skillstriker]

C) 2 solutions

 

[nightweaver066]

nightweaver066, that's a bit tricky, so far I've got to here and I'm stumped. Hint on what to do next?



EDIT: do I need to then do something like:



Then make the denominators common, or am I going down the wrong track here?

Maybe. Play around with what you think could work.

 

[Shazer2]

Maybe. Play around with what you think could work.

I'm not sure how to get those denominators common. :/ That's my only idea.

 

[Sy123]

Here is a good one that can be attempted with only year 10 knowledge:

 

[Shazer2]

Here is a good one that can be attempted with only year 10 knowledge:

Why am I so bad at maths? I don't even know where to start.

 

[likeaBOS]

Here you go:

P.s. Year 12 Extension kids are not encouraged to post their responses unless the prelim 2u students are stumped.

Would you use the discriminant and find that it's greater than 0 (being root 24), meaning there are two different/unique solutions for x, so C)?

 

[Sy123]

Why am I so bad at maths? I don't even know where to start.

Start by drawing a triangle and naming the sides a, b and
Then write down the givens in the question and try and manipulate an expression in order to get which is the area of the triangle.

Also I will add that this question is considered 'very tough' by some GMAT tutoring organisation (an American thing)

Would you use the discriminant and find that it's greater than 0 (being root 24), meaning there are two different/unique solutions for x, so C)?

You cannot use discriminant for this, it has a sine function which cannot be considered a co-efficient of x (since its a function), since its multiple choice its best to do this:



So we have two sides now. Graph both sides of the equation the number of intersections is the number of solutions.