An algebra problem by Rhoy Omega

Algebra Level 2

If f ( x − 2 3 ) = 5 x + 4 f(\frac {x-2}{3}) = 5x + 4 , what is f ( 5 ) + 11 f(5) + 11 ?


The answer is 100.

Rhoy Omega by Rhoy Omega , 24, Philippines

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2 solutions

Bleach Byakuya
Jun 21, 2014

let y = (x-2)/3 , x = 3y+2 f(y) = 5x+4 = 15y+14 f(5) = 89

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Deepak Gowda
Jun 20, 2014

Substitute x = 17 to evaluate f(5),

f(5) = 89, 89 + 11 = 100

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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