Math, asked by carlysiberman, 8 months ago

SHOW WORK 30 POINTS BEST ANSWER BRAINLIEST
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given that f(x)=-5x+8
a. find f^-1(x)
b. find f (3)
c. find f ^-1 (3)

Answers

Answered by BrainlyPopularman
3

{ \bold{ \boxed{ \boxed{  \huge\mathbb{ \red{ \star \: ANSWER \star}}}}}}

{ \bold{ \underline{Given} :  - }} \\  \\ {\bold{ \orange{ \mathtt{ \implies \: f(x) =  - 5x + 8}}}} \\  \\ { \bold{ \underline{To  \:  \: find} : -  }} \\  \\ {\bold{ \orange{ \mathtt{  \:  \:  \:  \:  \: . \:  \:  \:  {f}^{ - 1}(x) }}}} \\  \\  {\bold{ \orange{ \mathtt{  \:  \:  \:  \:  \: . \:  \:  \:  {f}^{ }(3) }}}} \\  \\  {\bold{ \orange{ \mathtt{  \:  \:  \:  \:  \: . \:  \:  \:  {f}^{ - 1}(3) }}}} \\  \\  \\ { \bold{ \boxed{ \boxed{ \mathbb{ \red{ \star \: SOLUTION \star}}}}}} \\  \\ { \bold{ \blue{   \implies  \: first \:  \: we \:  \: have \:  \: to \: find \:  \: f(3) - }}} \\  \\ { \bold{ \blue{ \:  \:  \:   \:  \:  \:  \: \: . \:  \: put \:  \: x = 3 \:  \: in \:  \: given \:  \: function - }}} \\  \\ { \bold{ \blue{ \:  \: \:  \:  \:  \: \:   \: . \:  \:  f(3) =  - 5(3) + 8}}}   \\  \\ { \bold{ \blue{ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  =  - 15  + 8 }}} \\  \\   { \bold{ \blue{ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:    =  - 7}}} \\  \\ { \bold{ \blue{ \implies \: now \:  \: we \:  \: have \:  \: to \:  \: find \:  \:  {f}^{ - 1}(x) -  }}} \\  \\ { \bold{ \blue{ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: . \:  \:lets \:  \: assume \:  \:  {f}^{ - 1}  (x) = y \:  \: then - }}} \\  \\  { \bold{ \blue{ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: \:  \: x \:  =  \: f(y)}}} \\  \\   { \bold{ \blue{ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: . \:  \:  =  > x =  - 5y + 8}}} \\  \\  { \bold{ \blue{ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: . \:  =  >  \: x - 8  = - 5y}}} \\  \\  { \bold{ \blue{ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: . \:   =  > \:y =  \frac{8 - x}{5}  }}} \\  \\  { \bold{ \blue{ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  so \:  \: that \:  - }}} \\  \\ { \bold{ \blue{ \:  \:  \:  \:  \:  \:  \: \:   \: . \:  \:   \:  { \boxed{{f}^{ - 1}  (x) =  \frac{8 - x}{5} }}}} }\\  \\ { \bold{ \blue{ \implies \:  \: now \:  \: we \:  \: have \:  \: to \:  \: find \:  \:  {f}^{ - 1} (3) -  }}} \\  \\ { \bold{ \blue{ \:  \:  \:  \:  \:  \:   \: \: . \:  \:   {f}^{ - 1} (3) =  \frac{8 - 3}{5}  }}} \\  \\ { \bold{ \blue{  \:  \:  \:  \:  \:  \:  \:  \: . \:  \:  {f}^{ - 1} (3) =  \cancel \frac{5}{5} }}} \\  \\ { \bold{ \blue{ \:  \:  \:  \:  \:  \:   \:   \: . \:  \:  { \boxed{{f}^{ - 1}  (3) = 1}}}}}

Answered by amishafilomeena1003
0

Answer:

Ans is 1

Step-by-step explanation:

hope this helps please follow

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