Ano ang zero (s) ng f (x) = 3x ^ 2 +5 -9x?

Sagot:

# x = (9 + -sqrt (21)) / 6 #

Paliwanag:

Kung #f (x) = 3x ^ 2 + 5-9x = 0 #

# 3x ^ 2-9x + 5 = 0 #

Gamit ang parisukat na formula:

#color (white) ("XXX") x = (9 + -sqrt (9 ^ 2-4 (3) (5))) / (2 (3)) #

#color (white) ("XXX") x = (9 + -sqrt (81-60)) / 6 #

#color (white) ("XXX") x = (9 + -sqrt (21)) / 6 #