Express value

Given that p = √(mx/t-t2 x)
Make x the subject
If m = 7, p = -3 and t = 4, find the value of x

Correct answer:

x =  -12/19

Step-by-step explanation:

m=7 p=3 t=4  p = (mx/tt2 x) p2 = mx/tt2 x p2 = x(m/t  t2)  x=m/tt2p2=7/442(3)2=1912=0.6316

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