The last term in the equation, which is on the second line, should be
= x ( 2.5 ) − 2 x ( 2.0 ) + x ( 1.5 ) ( 0.5 ) 2 {\displaystyle ={\frac {x(2.5)-2x(2.0)+x(1.5)}{(0.5)^{2}}}}
Return to errata.
