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4m2-256 = 0

Add 256 to both sides:

4m2 = 256

Divide both sides by 4:

m2 = 64

Square root both sides to find the value of m:

m = 8

Alternatively, if 4m is to be squared, and not just the m:

(4m)2 - 256 = 0

16m2 - 256 = 0

16m2 -256 + 256 = 256

16m2 = 256

16m2/16 = 256/16

m2 = 16

√m2 = √16

m = ±4

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โˆ™ 2012-07-05 15:20:50
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