Wyznacz zbiór rozwiązań równania. a) b) c) d) e) f)
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wik8947201
A) 5x-6=0 v 6x-4=0 v 2x+1=0 5x=6 v 6x=4 v 2x=-1 x=6/5 v x=2/3 v x=-1/2 x∈{-1/2, 2/3, 1 1/5} b) x=0 v 3x+3=0 v 2x+7=0 x=0 v x=-1 v x=-3,5 x∈{-3,5, -1, 0} c) x=0 v 3x+1=0 v 3x+4=0 x=0 v x=-1/3 v x=-4/3 x∈{-1 1/3, -1/3, 0} d) 4-3x=0 v 2-3x=0 v x-2=0 3x=4 v 3x=2 v x=2 x=4/3 v x=2/3 v x=2 x∈{2/3, 1 1/3, 2} e) x=0 v 7x-7=0 v 3x+3=0 x=0 v x=1 v x=-1 x∈{-1, 0, 1} f) x=0 v x-3=0 v x+5=0 x=0 v x=3 v x= -5 x∈{-5, 3, 0}
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basetla
A) (5x - 6)(6x - 4)(2x + 1) = 0 Wystarczy, aby jeden z czynników był równy zero, wtedy iloczyn jest równy zero: 5x - 6 = 0 5x = 6 /:5 x = 6/5 lub 6x - 4 = 0 6x = 4 /:6 x = 4/6 = 2/3 lub 2x + 1 = 0 2x = -1 /:2 x = -1/2 x = -1/2 v x = 2/3 v x = 6/5
b) 12x(3x + 3)(2x + 7) = 0 12x = 0 x = 0 lub 3x + 3 = 0 3x = -3 /:3 x = -1 lub 2x + 7 = 0 2x = -7 /:2 x = -7/2 x = -7/2 v x = -1 v x = 0
c) 3x²(3x + 1)²(3x + 4) = 0 3x² = 0 x = 0 lub 3x + 1 = 0 3x = -1 /:3 x = -1/3 lub 3x + 4 = 0 3x = -4 /:3 x = -4/3 x = -4/3 v x = -1/3 v x = 0
d) (4 - 3x)(2 - 3x)²(x - 2) = 0 4 - 3x = 0 -3x = -4 /:(-3) x = 4/3 lub 2 - 3x = 0 -3x = -2 /:(-3) x = 2/3 lub x - 2 = 0 x = 2 x = 2/3 v x = 4/3 v x = 2
e) 5x³(7x - 7)(3x + 3) = 0 5x³ = 0 x = 0 lub 7x - 7 = 0 7x = 7 /:7 x = 1 lub 3x + 3 = 0 3x = -3 /:3 x = -1 x = -1 v x = 0 v x = 1
f) x⁴(x -3)³(x+5)² = 0 x⁴ = 0 x = 0 lub x - 3 = 0 x = 3 lub x + 5 = 0 x = -5 x = -5 v x = 0 v x = 3
5x-6=0 v 6x-4=0 v 2x+1=0
5x=6 v 6x=4 v 2x=-1
x=6/5 v x=2/3 v x=-1/2
x∈{-1/2, 2/3, 1 1/5}
b)
x=0 v 3x+3=0 v 2x+7=0
x=0 v x=-1 v x=-3,5
x∈{-3,5, -1, 0}
c)
x=0 v 3x+1=0 v 3x+4=0
x=0 v x=-1/3 v x=-4/3
x∈{-1 1/3, -1/3, 0}
d)
4-3x=0 v 2-3x=0 v x-2=0
3x=4 v 3x=2 v x=2
x=4/3 v x=2/3 v x=2
x∈{2/3, 1 1/3, 2}
e)
x=0 v 7x-7=0 v 3x+3=0
x=0 v x=1 v x=-1
x∈{-1, 0, 1}
f)
x=0 v x-3=0 v x+5=0
x=0 v x=3 v x= -5
x∈{-5, 3, 0}
(5x - 6)(6x - 4)(2x + 1) = 0
Wystarczy, aby jeden z czynników był równy zero, wtedy iloczyn jest równy zero:
5x - 6 = 0
5x = 6 /:5
x = 6/5
lub
6x - 4 = 0
6x = 4 /:6
x = 4/6 = 2/3
lub
2x + 1 = 0
2x = -1 /:2
x = -1/2
x = -1/2 v x = 2/3 v x = 6/5
b)
12x(3x + 3)(2x + 7) = 0
12x = 0
x = 0
lub
3x + 3 = 0
3x = -3 /:3
x = -1
lub
2x + 7 = 0
2x = -7 /:2
x = -7/2
x = -7/2 v x = -1 v x = 0
c)
3x²(3x + 1)²(3x + 4) = 0
3x² = 0
x = 0
lub
3x + 1 = 0
3x = -1 /:3
x = -1/3
lub
3x + 4 = 0
3x = -4 /:3
x = -4/3
x = -4/3 v x = -1/3 v x = 0
d)
(4 - 3x)(2 - 3x)²(x - 2) = 0
4 - 3x = 0
-3x = -4 /:(-3)
x = 4/3
lub
2 - 3x = 0
-3x = -2 /:(-3)
x = 2/3
lub
x - 2 = 0
x = 2
x = 2/3 v x = 4/3 v x = 2
e)
5x³(7x - 7)(3x + 3) = 0
5x³ = 0
x = 0
lub
7x - 7 = 0
7x = 7 /:7
x = 1
lub
3x + 3 = 0
3x = -3 /:3
x = -1
x = -1 v x = 0 v x = 1
f)
x⁴(x -3)³(x+5)² = 0
x⁴ = 0
x = 0
lub
x - 3 = 0
x = 3
lub
x + 5 = 0
x = -5
x = -5 v x = 0 v x = 3