zapisz wartość funkcji f(x)=x2 −x−1 dla argumentu x=1− √2 w postaci a+b √c . a,b,c są liczbami całkowitymi...
f(x)=x²-x-1
f(1-√2)=(1-√2)²-(1-√2)-1
f(1-√2)=1-2√2+2-1+√2-1
f(1-√2)=1-√2
[Wzór: (a-b)²=a²-2ab+b²]
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f(x)=x²-x-1
f(1-√2)=(1-√2)²-(1-√2)-1
f(1-√2)=1-2√2+2-1+√2-1
f(1-√2)=1-√2
[Wzór: (a-b)²=a²-2ab+b²]