iheartfood
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iheartfood
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|dw:1352783711712:dw|
iheartfood
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graph A, graph B (top is A, bottom is B)
iheartfood
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graph C, graph D (Top is C, bottom is D)
*** the graphs are the answer choices.. idk which ... please help?
iheartfood
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idk, do u get it?
hartnn
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can u find intercepts ?
iheartfood
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idk how to,.. can u pls show me?
hartnn
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for y-intercept, put x=0
iheartfood
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what do i plug that into?
hartnn
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y=a(0+b)^(1/3)
iheartfood
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and i get y=0?
hartnn
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so y-intercept is ab^(1/3)
now since a and b are positive, y-intercept is also positive.
iheartfood
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okay, so what does that mean??
hartnn
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which rules out A,C
iheartfood
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okay so how do i figure out between B and D?
hartnn
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find x-intercept
iheartfood
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how do i do that?
hartnn
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put y=0 in that equation
iheartfood
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which one? the one we just found?
iheartfood
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so i get this?
0=ab^(1/3)
??
hartnn
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the original one
0=a(x+b)^(1/3)
so x= ?
iheartfood
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so i get
0=(ax+ab)^1/3
??? and idk how to find x= tho :(
hartnn
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0=a(x+b)^(1/3)
(x+b) = 0 (because a is positive and not 0, x+b must be 0)
so x=-b
means x - intercept is negative
hartnn
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which graph among, B and d has x-intercept negative ?
iheartfood
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okay, so hmmm is it B then??
the one i attached??
hartnn
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yes, its b
iheartfood
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okay thanks!!! :)
hartnn
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DID U UNDERSTAND HOW ITS DONE ?
iheartfood
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yeah :) find the intercepts and substitute and see whether it positive or negative... and u first find the first one and rule it out, then u narrow the answers down based on that intercept... then you find the next intercept and see if its pos or neg. and based on that u find ur graph.
is that right? did i understand it correctly? :)
hartnn
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oh,yes ! :)
iheartfood
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yayy!! :) thank youuu :)
hartnn
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what about finding intercepts, did u get how to find them ?
iheartfood
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i think so... i do get confused about it tho sometimes... :( could u pls give me a summary on how to find them? so i understand them more clearly??