Question

Tìm x :

x² - 10x = -25

x^{2 -} 12x = -36 

Answer 1

b)x²-12x+36=0

(x-6)²=0

x-6=0

x=6

Answer 2

a)x²-10x+25=0

(x-5)²=0

x-5=0

x=5

Answer 3

x² - 10x = -25

x² - 2 . x . 5 + 5² = 0

(x - 5)² = 0

x - 5 = 0

x = 5

x² - 12x = -36

x² - 2 . x . 6 + 6² = 0

(x - 6)² = 0

x - 6 = 0

x = 6

Chúc bạn học tốt ^^

Answer 4

\(x^2-10x=-25\)

\(\Rightarrow x^2-10x+25=0\)

\(\Rightarrow x^2-2.5.x+5^2=0\)

\(\Rightarrow\left(x-5\right)^2=0\)

\(\Rightarrow x-5=0\)

\(\Rightarrow x=5\)

Vậy \(x=5\)

\(x^2-12x=-36\)

\(\Rightarrow x^2-12x+36=0\)

\(\Rightarrow x^2-2.6.x+6^2=0\)

\(\Rightarrow\left(x-6\right)^2=0\)

\(\Rightarrow x-6=0\)

\(\Rightarrow x=6\)