3. Show that function y = 4x - 9 is
increasing for all x ER.
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Given : function y = 4x - 9
To Find : Show that function is increasing for all x ∈ R
Solution:
y = 4x - 9
=> dy/dx = 4
4 > 0
=> dy/dx > 0 for x ∈ R
as its independent of value of x
Hence function is increasing for all x ∈ R
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