Jawaban: Rumus Mencari Persamaan kuadrat melalui titik puncak [tex]y = a(x - xp) {}^{2} + yp \\ 2 = a(0 - ( - 1)) {}^{2} + 4 \\ 2 = a + 4 \\ a = 2 - 4 \\ a = - 2[/tex] Maka [tex]f(x) = a(x - xp) {}^{2} + yp \\ f(x) = - 2(x - ( - 1)) {}^{2} + 4 \\ f(x) = - 2(x + 1) {}^{2} + 4 \\ f(x) = - 2( {x}^{2} + 2x + 1) + 4 \\ f(x) = ( - 2 x{}^{2} - 4x - 2) + 4 \\ f(x) = - 2x {}^{2} - 4x - 2 + 4 \\ f(x) = - 2x {}^{2} - 4x + 2[/tex]
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