Question

Tìm x, biết:

a) 5x ( x - 1 ) - ( 1 - x ) = 0

b) ( x - 3 )² - ( x + 3 )² = 24

c) 2x ( x² - 4 ) = 0

Answer 1

5x ( x + 1 ) ( x - 1 ) > 0

đầu tiên , giải quyết cho 5x ( x + 1 ) ( x - 1 ) = 0

5x = 0 x = 0

5x ( x + 1 ) ( x - 1 ) = 0 - > x + 1 = 0 - > x = -1

x - 1 = 0 x = 1

Answer 2

a) 5x ( x - 1 ) - ( 1 - x ) = 0

=> 5x(x - 1) - 1 + x = 0

=> 5x(x - 1) + (x - 1) = 0

=> (x - 1)(5x + 1) = 0

=> x - 1  = 0 hoặc 5x + 1 = 0

+) x - 1 = 0 => x = 1

+) 5x + 1 = 0 => 5x = -1

=> x = -1/5