Fungsi f (x) = 4 x – 3 , Jika f ( a ) = 7 dan f ( -2 ) = b , Maka a + b , adalah …….

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Fungsi f (x) = 4 x – 3 , Jika f ( a ) = 7 dan f ( -2 ) = b , Maka a + b , adalah …….

Jawaban:

f(x) = 4x - 3 \ f(a) = 4a - 3 = 7 \ 4a = 7 + 3 = 10 \ a = frac{10}{4}

f( - 2) = 4( - 2) - 3 = b \ b = - 8 - 3 = - 11

a + b = frac{10}{4} + ( - 11) = frac{5}{2} - frac{22}{2} = - frac{17}{2}