Prosze o pomoc z zadaniami z algebry
a) (2x+1) (2x-1) - (2x-1)²>-4
b) (x+3)² - (x-5)² + 16(x-1)
c) 2x-3 - X = 3(2x+1) - x-1
___________________ - kreska ułamkowa
4 5 2
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a)
(2x+1)(2x-1) - (2x-1)² > -4
4x² -1 - (4x²-4x+1) > -4
4x² - 1 - 4x² + 4x - 1 > -4
4x - 2 > -4
4x > -4 + 2
4x > -2 /:4
x = -1/2
b)
(x+3)² - (x-5)² = 16(x-1)
x² + 6x + 9 - (x² - 10x + 25) = 16x - 16
x² + 6x + 9 - x² + 10x - 25 = 16x - 16
16x - 16 = 16x - 16
16x - 16x = -16 + 16
0 = 0, równanie nieoznaczone, nieskończenie wiele rozwiązań
c)
2x - 3 x x - 1
-------- - ----- = 3(2x + 1) - -------- I*20
4 5 2
5(2x - 3) - 4x = 60(2x + 1) - 10(x-1)
10x - 15 - 4x = 120x + 60 - 10x + 10
6x - 15 = 110x + 70
6x - 110x = 70 + 15
-104x = 85 /:(-104)
x = -85/104
to bd do kwadratu - ^2
a)4x^2-2x+2x-1-(4x^2-2x-2x+1)>-4
4x^2-2x+2x-1-4x^2+2x+2x-1>-4
4x-2.>-4 4x>-6/:-4 x<1 i1/2 b)(x+3)2-(x-5)2=16(x-1)
x2+6x+9-x2+10x+25=16x-16
x2+6x-x2+10x-16x+-16-25-9
0=-45
Równanie sprzeczne
c) x-3=6x+3-x-1
-----------------------------
40
-4x=5
---------------------------
40
x=-1/2