pls help (1 Viewer)

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[jimmysmith560]

Would this help?

 

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I saw the solution but its confusing

 

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as they apply a weird forumla I have never seen in the first step

 

[jimmysmith560]

I saw the solution but its confusing

as they apply a weird forumla I have never seen in the first step

This question deals with internal division. The formula for internal division is as follows:

There is also external division. The formula for external division is as follows:

 

[=)(=]

ohh okay makes sense

 

[icycledough]

Isn't internal/external division removed from the syllabus?

Yep, it's no longer in the new syllabus.

 

[vishnay]

as they apply a weird forumla I have never seen in the first step

don't use the formula

draw it out and just multiply the vector by a scalar

in this case and continue from there like usual

 

[CM_Tutor]

Such problems can be done by vector methods, as noted above, though how internal / external division formulae would be treated is unknown. If I were setting such a question, I would word it to mandate the use of vectors so that I could avoid having to credit using the theory that ceased to be in the syllabus from the 2020 HSC onwards.

I have seen another piece of now-removed theory, the angle between two lines, being derived in an MX2 trial this year using vectors and that was worded to avoided the much simpler derivation by MX1 / trigonometry methods.