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f(x)= 4x² + (p+1)x - 20
= 4(½)² + ½p+½ - 20
= 4(¼) + ½p+½ - 20
= 1 + ½p+½ - 20
½p= 1 + ½ - 20
½p= -19 + ½
p= -19 +(½:½)
p= -19 + 1
p= -18