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OpenStudy (anonymous):
(a) Factorise x^2-9. (b) Use your answer to part (a) to find two factors of 9991, other than 1 and 9991.
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OpenStudy (anonymous):
I know (A) is (x-3)(x+3). But I don't know how to do part (b).
OpenStudy (anonymous):
9991=(x+3)(x-3)=x^2-9 10000=x^2 x=100 9991=(100+3)(100-3) 9991=103*97
OpenStudy (experimentx):
Oh ... lol sorry
OpenStudy (anonymous):
Thank you.
OpenStudy (anonymous):
Sure thing :)
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