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a²-2ab-1+a²-4ab+5=?
2a²-6ab+4 = ?
a=¼
b=2
2a²-6ab+4 = ?
2*(¼)² -6*¼*2 +4 =
2*1/16 -6*½ +4=
⅛ -3 +4=
⅛ +1 =
1⅛
= a² - 2ab - 1 + a² - 4ab + 5 =
= -6ab + 4 =
= -6(¼ * 2) + 4 =
= -6 * ½ + 4 =
= 3 + 4 =
= 7
;))