Question

Tìm x:

x2 -7x + 10 = 0

Giúp mk với nha

Answer 1

\(x^2-7x+10=0\)

\(\Leftrightarrow x^2-2x-5x+10=0\)

\(\Leftrightarrow x\left(x-2\right)-5\left(x-2\right)=0\)

\(\Leftrightarrow\left(x-2\right)\left(x-5\right)=0\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x-2=0\\x-5=0\end{array}\right.\) \(\Leftrightarrow\left[\begin{array}{nghiempt}x=2\\x=5\end{array}\right.\)

Answer 2

x² -7x + 10 = 0

=> x² - 2x - 5x + 10 = 0

=> x(x - 2) - 5(x - 2) = 0

=> (x - 5)(x - 2) = 0

=> x-5=0;x=5

      x-2=0;x=2

Vậy x = 2 hoặc x = 5