find the zero function of...?

f(x) = 3x² - x - 4

2007-09-05 04:04:20 · 2 answers · asked by Michael S 1 in Science & Mathematics ➔ Mathematics

f(x) = 3x² - x - 4=(3x-4)(x+1)
so x=-1 and x=4/3

2007-09-05 04:13:55 · answer #1 · answered by meg 7 · 1⤊ 0⤋

3x^2-x-4=0
ax^2+bx+c=0
x=[-b+-sqrt(b^2-4ac)]/2a
a=3 b=-1 c=-4
x=[1+sqrt(1+48)]/6=[1+7]/6=8/6=4/3
x=[1-7]/6=-1

2007-09-05 11:14:04 · answer #2 · answered by cidyah 7 · 0⤊ 2⤋

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