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let f(x)=2x-6. solve f^-1(x) when x=2.

Sagot :

konrad509
[tex]f(x)=2x-6\\ y=2x-6\\ 2x=y+6\\ x=\frac{1}{2}y+3\\ f^{-1}(x)=\frac{1}{2}x+3\\ f^{-1}(2)=\frac{1}{2}\cdot2+3\\ f^{-1}(2)=1+3\\ f^{-1}(2)=4 [/tex]
Ryan2
a) Calculating f⁻¹(x)

[tex]y=2x-6\\ \\ x=2y-6\\ \\ 2y=x+6\\ \\ y=\frac{x+6}{2}\\ \\ \boxed{f^{-1}(x)=\frac{x+6}{2}}[/tex]

b) Calculating f⁻¹(2)

[tex]\boxed{\boxed{f^{-1}(2)=\frac{2+6}{2}=\frac{8}{2}=4}}[/tex]


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