LATIHAN SOAL FUNGSI KUADRAT
SOAL BERIKUT PENYELESAIAN 1. y = x^2 – 25 y = 0 0 = x^2 – 25 (x – 5) (x + 5 ) x = 5 x = -5 (5, 0) (-5, 0) x = 0 y = 0^2 – 25 y = -25 (0, -25) Xp = - (b/2a) = -(0/2.1) = 0 Yp = -(b^2 – 4ac/4a) = -(0^2 – 4.1.-25/4.1) = -(0+100/4) = -25 (0, -25) 2. y = -x^2 + 7x – 12 y = 0 0 = x^2 + 7x – 12 (-x + 4 ) (x – 3) x = 4 x = 3 (4, 0) (3, 0) x = 0 y = 0^2 +7(0) – 12 y = -12 (0, -12) Xp = -(b/2a) ...