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Solve 4r2 – 9 = 91. A:{±3} B:{±4} C:{±5} D:{±6}
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Solve 4r2 – 9 = 91. A:{±3} B:{±4} C:{±5} D:{±6}
asked
Nov 1, 2018
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Solve 4r2 – 9 = 91.
A:{±3}
B:{±4}
C:{±5}
D:{±6}
Mathematics
middle-school
Muhamed AlGhzawi
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Muhamed AlGhzawi
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4r² - 9 = 91
4r² = 91 + 9
4r² = 100
r² = 25
r = + / - 5
Correct option C
Stefan Dochow
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Nov 2, 2018
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Stefan Dochow
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Take the root of both sides and solve. The answer is C.
Elyas
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Nov 7, 2018
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Elyas
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