a function is defined as follows: f:[-2,a] = R where f(x) = (x-1)^2 -4 if f(a) = 12 then find the value of a if anyone could help me with this it would be very much appreciated
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Originally Posted by gbooker a function is defined as follows: f:[-2,a] = R where f(x) = (x-1)^2 -4 if f(a) = 12 then find the value of a if anyone could help me with this it would be very much appreciated hi f(a)=(a-1)^2-4 12=(a-1)^2-4 (a-1)^2=16 $\displaystyle a-1=\pm 4$ a=5 or a=-3 but check its domain , [-2,a] -3 is outside the domain , so a=5 .
thanks for a lot for your help
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