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標題:

中4的MATHS-請指教！！我不會做。

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發問:

it is given that z=(m-3)+(2m+8)i,where m is a real number and i（的2次方)= -1 . according to each of the following conditions,find the value of m. (a)z is a real number. (b)z is a purely imaginary number. 幫幫忙，最好今天內回答我吧%>_
最佳解答:

it is given that z=(m－3)+( 2m +8)i,where m is a real number and i（的2次方)= －1， according to each of the followingconditions,find the value of m. (a)z is a real number. z=(m－3)+( 2m +8)i z is a real number 2m +8= 0 m=－4 (b)z is a purely imaginary number. z=(m－3)+( 2m +8)i z is a purely imaginary number. m－3=0 and 2m +8 0 m=3

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