Question

x.(x-3)=0

(x+7).(x-8)=0

Answer 1

x(x - 3) = 0

=> x = 0 hoac x - 3 = 0

=> x = 0 hoac x = 3

vay_

(x + 7)(x - 8) = 0

=> x + 7 = 0 hoac x - 8 = 0

=> x = -7 hoac x = 8

vay_

Answer 2

+) \(x.\left(x-3\right)=0\)

=> \(\orbr{\begin{cases}x=0\\x-3=0\end{cases}}\)

=> \(\orbr{\begin{cases}x=0\\x=3\end{cases}}\)

+) \(\left(x+7\right).\left(x-8\right)=0\)

=> \(\orbr{\begin{cases}x+7=0\\x-8=0\end{cases}}\)

=> \(\orbr{\begin{cases}x=-7\\x=8\end{cases}}\)

Answer 3

x . ( x - 3 ) = 0

2x -3x = 0

2x = 3x

=> 2 . 3 = 2x 

6 = 2x

6 : 2 = x

3 = x

vậy x = 3 hoặc x = 0

( x + 7 ) . ( x - 8 ) = 0

=> ( x + 7 ) = 0 hoặc ( x- 8 ) = 0

=> x = 0 - 7                x = 0 + 8

x = -7                          x = 8

vậy x = -7 hoặc x = 8