x(3x-16)=-5
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x^2-10x=-25
x.x-10x=-25
x.(x-10)=-25
=>x=-25 hoặc x-10=-25
x =-35
Vậy x thuộc {-25;-35}
How many trees did your school plant around school last week?
How many chung cakes did Hung eat yesterday?
How many houses in Ha Noi does Minh have?
1. How many trees did your school plant around school last week?
2. How many did Hung eat Chung cakes yesterday?
3. How many houses does Minh have in HN?
x(3x-16)=-5
⇔3x2-16x+5=0
⇒3(x2-\(\dfrac{15+1}{3}\)x+\(\dfrac{5}{3}\))=0
⇔(x-\(\dfrac{1}{3}\))(x-5)=0
⇔\(\left\{{}\begin{matrix}x-5=0\Rightarrow x=5\\x-\dfrac{1}{3}=0\Rightarrow x=\dfrac{1}{3}\end{matrix}\right.\)