a)
x²-49=0
x²=49
x=7 lub x=-7
b)
x²-144=0
x²=144
x=12 lub x=-12
c)
9x²-1=0
9x²=1 /:9
x²=1/9
x=1/3 lub x=-1/3
d)
36x²-1=0
36x²=1 /:36
x²=1/36
x=1/6 lub x=-1/6
e)
4x²-81=0
4x²=81 /:4
x²=20,25
x=4,5 lub x=-4,5
f)
25x²-36=0
25x²=36 /:25
x²=36/25
x=6/5 lub x=-6/5
a) x² - 49 = (x-7)(x+7)
x-7 = 0 x+7 = 0
x=7 x=-7
b) x² - 144 = (x-12)(x+12)
x=12 x=-12
c) 9x² - 1 = (3x - 1)(3x +1)
3x-1 = 0 3x+1=0
3x =1 /:3 3x = -1 /:3
x = 1/3 x = -1/3
d) 36x² - 1= (6x-1)(6x+1)
6x-1=0 6x + 1=0
x = 1/6 x = -1/6
e) 4x² - 81 = (2x- 9)(2x+9)
2x - 9 = 0 2x + 9 = 0
x = 9/2 = 4 1/2 x = -9/2 = -4 1/2
f) 25x² - 36 = (5x-6)(5x+6)
5x - 6 = 0 5x +6=0
x = 6/5 = 1 1/5 x = -6/5 = - 1 1/5
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a)
x²-49=0
x²=49
x=7 lub x=-7
b)
x²-144=0
x²=144
x=12 lub x=-12
c)
9x²-1=0
9x²=1 /:9
x²=1/9
x=1/3 lub x=-1/3
d)
36x²-1=0
36x²=1 /:36
x²=1/36
x=1/6 lub x=-1/6
e)
4x²-81=0
4x²=81 /:4
x²=20,25
x=4,5 lub x=-4,5
f)
25x²-36=0
25x²=36 /:25
x²=36/25
x=6/5 lub x=-6/5
a) x² - 49 = (x-7)(x+7)
x-7 = 0 x+7 = 0
x=7 x=-7
b) x² - 144 = (x-12)(x+12)
x=12 x=-12
c) 9x² - 1 = (3x - 1)(3x +1)
3x-1 = 0 3x+1=0
3x =1 /:3 3x = -1 /:3
x = 1/3 x = -1/3
d) 36x² - 1= (6x-1)(6x+1)
6x-1=0 6x + 1=0
x = 1/6 x = -1/6
e) 4x² - 81 = (2x- 9)(2x+9)
2x - 9 = 0 2x + 9 = 0
x = 9/2 = 4 1/2 x = -9/2 = -4 1/2
f) 25x² - 36 = (5x-6)(5x+6)
5x - 6 = 0 5x +6=0
x = 6/5 = 1 1/5 x = -6/5 = - 1 1/5