2 Answers

Zalak Bhalani · Answer 1 · 2017-02-12T13:18:28+0000

when the graph touches x axis at that point y = 0

So, putting y =0
0 = -3x^2 + x +4
so, if you factoriazte it

−3x^2++4x−3x+4=0

−3x(x+1)+4(x+1)=0

(x+1)+(−3x+4)=0

x=−1,4/3

So, two time at -1 and 4/3 it touches the x-axid

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