1 oblicz wartość liczbową wyrażenia : a] x do potęgi 2 + x - 1 dla x = - 1 b] 2[-x+4] dla x = - 10 c] 1-y +x dla x = 2 i y = - 1
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a) x² + x -1
-1² + (-1) -1=
= 1 -1 -1 =
= 0 -1 =
= -1
b) 2 [ -x + 4 ]
2 [ -x + 4] =
= -2x + 8 =
= -2 * -10 + 8 =
= 20 + 8 =
= 28
c) 1 -y + x
1 - (-1) +2 =
= 1 + 1 + 2 =
= 2 + 2 =
= 4
Mam nadzieję, że pomogłam... :D
I liczę na naj... :D
Pozdrawiam...
a)
x²+x-1, dla x = -1
(-1)²+(-1)-1 = 1-1-1 = 1-2 = -1
b)
2[-x+4], dla x -10
2[-(-10)+4] = 2[10+4] = 2*14 = 28
c)
1-y+x, dla x = 2 i y = -1
1-(-1)+2 = 1+1+2 = 4