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[-x+2y-2z=4,quad 2x-3y+4z=-3],[" Q.25.Co...

[-x+2y-2z=4,quad 2x-3y+4z=-3],[" Q.25.Consider "f:R_(t)rarr[-5,oo)" given by "f(x)=9x^(2)+6x-5." Show that "f" is invertible with "],[qquad f^(-1)(y)=((sqrt(y+6)-1)/(3))],[" Hence find "],[[" (i) "f^(-1)(10)," (ii) "y" if "f^(-1)(y)=(4)/(3)]]

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