Question

oblicz wartosc wyrazenia 2 (x-1)[2]+1/3 dla x=1,y=-3 x=3/4,y=-2i1/4

Answer 1

2(x-1)²+⅓=2(x²-2x+1) +⅓=2x²-4x+2+⅓=2x²-4x+2⅓

dla x=1  

2·1²-4·1+2⅓=2-4+2⅓ =⅓

dla x=¾

2·(¾)²-4·¾+2⅓ =2·9/16 -3 + 2⅓ =9/8 -²/₃ =27/24 - 16/24 =11/24

dla x=-3

2·(-3)² -4·(-3)+2⅓ =18+12+2⅓ =32⅓

dla x=-2¼

2·(-9/4)² -4·(-9/4) +2⅓ =2·81/16 +36/4 +2⅓ =81/8 +9+2⅓ =10¹/₈ +11⅓ =81/8+34/3 =

243/24 +272/24 =515/24 =21 ¹¹/₂₄