jika a= 4,b=-4dan c=8 maka ab2-√1/2c

= 4.-4.2 - akar 1/2.8
= -32 - akar 1/16
= -32 - 1/4
= -32 - 0,25
= -32,25

atau
= 4.-4.2 - akar 1/2.8
= -32 - akar 1/16
= -32 - 1/4
= -128/4 - 1/4
= -129/4
= -32,25