Question

Selesaikanlah permasalahan-permasalahan berikut ini
a. Y = x2+1
Y = -x2+4x-0

b. Y = -2x2
Y = x2+2x+1

c. Y = x2-2x-3
Y = -x2+8x-12

Answer 1

A. Y = Y
x^2 + 1 = -x^2 + 4x - 0
x^2 + 1 + x^2 - 4x + 0 = 0
2x^2 - 4x + 1 = 0
D = b^2 - 4ac
= (-4)^2 - 4 (2).(1)
= 16 - 8
= 8