Nilai msksimun minimum f(x)=xpangkat2+3x dengan iterval (-2,1)

jawab

f(x ) = x² + 3x
minimum jika  f '(x ) = 0
2x + 3=0
x = - 3/2

f( - 3/2)  = (- 3/2)² + 3(-3/2)
f (-3/2) = 9/4 -9/2 
f(-3/2) = - 9/4
nilai min = - 9/4 = - 2 ¹/₄