Find the minimum value of X2 - 3x + 2 for all real values of x

Assessment: JAMB UTME - Mathematics - 2008 Subject: General Mathematics

Question 1 Report

Find the minimum value of X2 - 3x + 2 for all real values of x
Answer Details
y = X2 - 3x + 2,  d y d x  = 2x - 3
at turning pt,  d y d x  = 0
∴ 2x - 3 = 0
∴ x =  3 2
d 2 y d x 2  =  d d x ( d d x )
= 270
∴ ymin = 2 3 2  - 3 3 2  + 2
=  9 4  -  9 2  + 2
= -

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