Uprość wyrażenie.
(x² - 2) (x²+2) - (4 - x²) (x²+4)
Z 2
Oblicz wartość wyrażenia.
(2x-1)² - (2x-1) (1+2x) - (2x+1)² dla x = √2
1
---------------- dla x=1 +√2
2x²- 6
------- ( To jest Kreska Ułamkowa)
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(x² - 2) (x²+2) - (4 - x²) (x²+4)=
x⁴-4+(x²-4)(x²+4)=
x⁴-4+x⁴-16=
2x⁴-20
----------------------------------------
(2x-1)² - (2x-1) (1+2x) - (2x+1)² =
4x²-4x+1-(4x²-1)-(4x²+4x+1)=
4x²-4x+1-4x²+1-4x²-4x-1=
-4x²-8x+1
-4*√2²-8*√2+1=
-4*2-8√2+1=
-8-8√2+1=
-7-8√2
-----------------------------------
1/(2x²-6)=
1/2(x²-3)
1/(2*((1+√2)²-3))=
1/(2(1+2√2+4-3)=
1/(2(2√2+2)=
1/4(√2+1)=
(√2-1)/(4(√2+1)(√2-1))=
(√2-1)/(4(2-1))
(√2-1)/4