Let f(x) be a polynomial function satisfying f'(x) + f(x)=x. Then the value of f(4) is equal to (1) 1 (4) 4 (2) 2 (3)3

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lit ( f(x)=9 x+6 ) ( f^{prime}(x)=a ) given ( f(x)+f^{prime}(x)=x ) ( quad ) ax ( x+6=x ) so ( (9=1) mid begin{array}{c}a+6=0 6=7end{array} ) ( f(x)=x-1 ) ( f(4)=4-1=3 )

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