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OpenStudy (anonymous):
help meeeee again, please? Let f(x) = (x2 - 2x)2 - 23(x2 - 2x). Find all x such that f(x) = -120. a. 4,5 b. 8,15 c. -2,-3,8,15,4,5 d. -2,-3,4,5
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jhonyy9 (jhonyy9):
a. will be (16-8)2 -23(16-8)=64-184 = -120 so is right
jhonyy9 (jhonyy9):
225-23*15=225-345=-120 is right
jhonyy9 (jhonyy9):
so a. is right all
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