rozwiąż równania kwadratowe niezupełne.wraz z odpowiedzią i ilością rozwiązań
a)x²-4=0
b)25x²-36=0
c)x²-5=0
d)7x²=1
a) x²-4 = 0
(x+2)(x-2) = 0
x+2 = 0 => x = -2
lub
x-2 = 0 => x = 2
Odp. x = -2 v x = 2
b)
25x²-36 = 0
(5x+6)(5x-6) = 0
5x+6 = 0
5x = -6
x = -6/5
5x-6 = 0
5x = 6
x = 6/5
Odp. x = -6/5 v x = 6/5
c)
x²-5 = 0
(x+√5)(x-√5) = 0
x+√5 = 0
x = -√5
x -√5 = 0
x = √5
Odp. x = -√5 v x = √5
d)
7x² = 1 /:7
x² = 1/7
Odp. x = -√(1/7) v x = √(1/7)
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a) x²-4 = 0
(x+2)(x-2) = 0
x+2 = 0 => x = -2
lub
x-2 = 0 => x = 2
Odp. x = -2 v x = 2
b)
25x²-36 = 0
(5x+6)(5x-6) = 0
5x+6 = 0
5x = -6
x = -6/5
lub
5x-6 = 0
5x = 6
x = 6/5
Odp. x = -6/5 v x = 6/5
c)
x²-5 = 0
(x+√5)(x-√5) = 0
x+√5 = 0
x = -√5
lub
x -√5 = 0
x = √5
Odp. x = -√5 v x = √5
d)
7x² = 1 /:7
x² = 1/7
Odp. x = -√(1/7) v x = √(1/7)