Question

Tentukan jumlah dan hasil kali akar-akar persamaan kuadrat berikut
a.x2 + 2x - 5 = 0
b.x2 - 5x + 7 = 0
c.2x2 + 6x - 5 = 0
d.6x2 - 8x + 6 = 0

Answer 1

X1 + x2 = -b/a dan x1 . x2 = c/a

a. x^2 + 2x - 5 = 0
x1 + x2 = -2/1 = -2
x1.x2 = -5/1 = -5

b. x^2 - 5x + 7 = 0
x1 + x2 = -(-5)/1 = 5
x1.x2 = 7/1 = 7

c. 2x^2 + 6x - 5 = 0
x1 + x2 = -6/2 = -3
x1.x2 = -5/2

d. 6x^2 - 8x + 6 = 0
x1 + x2 = -(-8)/6 = 4/3
x1.x2 = 6/6 = 1