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OpenStudy (anonymous):
OpenStudy (jbo11):
well you can prove you are right by putting in a test number for x. For example 4, and then find y and see if it fits the graph
OpenStudy (anonymous):
so you mean :
f(x) = -1/2 (4)^3?
OpenStudy (jbo11):
yes, then solve, so that could also look like y=-1/2(4)^3 and solve for y. and the best way to prove your answer is right, do one more so then you check two points rather than one
OpenStudy (jbo11):
oh and i see the graph is a bit small so if you must, try small numbers like 1 and 2, works the same
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OpenStudy (anonymous):
ok:
fx = -1/2(2)^3
fx = -1/2 x 8
fx = -4
OpenStudy (anonymous):
and:
fx = -1/2
OpenStudy (jbo11):
good, and so for -4 check the graphs, which graph has the point (2, -4)? and then that's your answer
OpenStudy (anonymous):
graph d
OpenStudy (jbo11):
yup, so yes you had the right answer, but now you understand how to check rather than just knowing the answer to one problem
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