Решите уравнение:
a) x₂+64
б) x₂-144=0
в) x₂+25=0
г) x₂-5=0
д) (x-1)₂=9
е) (x+5)₂=0
X^2 + 64 = 0
x^2 = - 64 - корней нет
x^2 - 144 = 0
x^2 = 144
x1 = 12
x2 = - 12
x^2 + 25 = 0
x^2 = - 25 - корней нет
x^2 - 5 = 0
x^2 = 5
x1 = √5
x2 = - √5
(x - 1)^2 = 9
x^2 - 2x + 1 - 9 = 0
x^2 - 2x - 8 = 0
D = 4 + 32 = 36 = 6^2
x1 = ( 2 + 6) / 2 = 4
x2 = ( 2 - 6) / 2 = - 2
(x+ 5)(x+ 5) = 0
x + 5 = 0
x = - 5
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