Question

Untuk fungsi y= x^2 - 2- 8 . tentukan titik puncak dengan rumus ( -b/2a , D/-4a ). diperoleh titik puncak ?

Answer 1

Y = x^2 - 2x - 8
a = 1, b = -2, c = -8
x = -b/2a = -(-2)/2(1) = 2/2 = 1
y = D/-4a = (b^2 - 4ac)/-4a = ((-2)^2 - 4(1)(-8)) / -4(1) = 36/-4 = -9
titik puncak = (1,-9)