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quadratic question (1 Viewer)

Thread starter jjuunnee
Start date Jul 30, 2016

J

jjuunnee

Active Member

#1

Find values of m such that mx² + 3x - 4 < 0 for all x

I

InteGrand

Well-Known Member

#2

jjuunnee said:
Find values of m such that mx² + 3x - 4 < 0 for all x

Find the discriminant in terms of m and solve for m so that the following two conditions hold: 1) m is negative, and 2) the discriminant is negative.

ProdigyInspired

Tafe Advocate

#3

Hint: Use discriminant.

Green Yoda

Hi Φ

#4

Δ=9-4(m)(-4)<0
∴9+16m<0
∴m<-9/16

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