Hi

 y = ax^2 + bx + c  || (0,4) ⇒ c = 4

    4a - 2b  = -22  (-18-c)   ||Mult 1st Eq by 2 and Add to 2nd

   16a + 4b  = 20   (24-c)

     24a= -24

      a = -1   and b =  9 

y = -x^2 +9x + 4 

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