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OpenStudy (anonymous):
Factor x^2+10x+21
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hartnn (hartnn):
what 2 numbers have product =21 and sum = 10 ??
OpenStudy (anonymous):
3 X 7 =21 3+7 = 10
hartnn (hartnn):
thats right! so u write 10x as 3x+7x ok? x^2+3x+7x+21 do u know what to do next?
OpenStudy (anonymous):
factor by grouping?
hartnn (hartnn):
yes, try it and tell me what u get?
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OpenStudy (anonymous):
(x+3)(x+7)
hartnn (hartnn):
that is correct final answer! good work :)
OpenStudy (anonymous):
thank yu c:
hartnn (hartnn):
welcome ^_^
OpenStudy (aravindg):
oops i am late :) nicely done @hartnn
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hartnn (hartnn):
thanks :) i'll leave next problem for u :)
OpenStudy (aravindg):
thats kind of you
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