Rozwiąż rówanie
xdo kwadratu + 2 to wszystko podzielone przez 2=4x+1
x ^2 + 2 /2 = 4x +1
mnożymy na krzyż czyli
x^2 + 2 = 2 (4x +1)
x^2 + 2 = 8x + 2 / -2; -8x
x^2 - 8x = 0
x (x-8) = 0
x=0 lub x = 8
x^2
____ = 4x +1 / razy dwa obustronnie.
2
x^2 = 2(4x+1)
x^2 = 8x+2
x^2 - 8x - 2 =
delta = 64+ 8
pierwiastek z delty = pierw72 = 6 pier 2
x1 = 8 + 6 pierw 2
___________ = 4 + 3 pier 2
x2 = 8 + pierw.72
___________ 4 - 3 pier 2
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x ^2 + 2 /2 = 4x +1
mnożymy na krzyż czyli
x^2 + 2 = 2 (4x +1)
x^2 + 2 = 8x + 2 / -2; -8x
x^2 - 8x = 0
x (x-8) = 0
x=0 lub x = 8
x^2
____ = 4x +1 / razy dwa obustronnie.
2
x^2 = 2(4x+1)
x^2 = 8x+2
x^2 - 8x - 2 =
delta = 64+ 8
pierwiastek z delty = pierw72 = 6 pier 2
x1 = 8 + 6 pierw 2
___________ = 4 + 3 pier 2
2
x2 = 8 + pierw.72
___________ 4 - 3 pier 2
2