Question

Tìm x biết ( x-3).(x+3)- x.(x-5)=11 . Gíup mình nhé ! cảm ơn

Answer 1

(x - 3)(x + 3) - x(x - 5) = 11

<=> x² - 9 - x² + 5x = 11

<=> 5x - 9 = 11

<=> 5x = 20

<=> x = 4

Vậy x = 4

Answer 2

\(\left(x-3\right)\left(x+3\right)-x\left(x-5\right)=11\Leftrightarrow x^2-3^2-x^2+5x=11\Leftrightarrow5x=20\Leftrightarrow x=4\)