Dari persamaan kuadrat 2x^2 – x – 15 = 0 maka -b + akar b^2 – 4ac per 2a =

Jawaban:

3

Penjelasan:

a = 2

b = -1

c = -15

-b + √(b^2 – 4ac) / 2a

= -(-1) + √((-1)^2 – 4(2)(-15)) / 2(2)

= 1 + √(1+120) / 4

= 1 + √121 / 4

= 1 + 11 / 4

= 12/4

= 3