Question

Bài 3: Tìm x biết:

a. \(2x+10=0\)

b. \(-2x+5=0\)

c. \(4-x=0\)

d. \(2x+1=0\)

e. \(x^2+2=0\)

f. \(2x+x=0\)

Answer 1

a)\(=>2x=-10=>x=-5\)

b)\(=>-2x=-5=>x=\dfrac{-5}{-2}=\dfrac{5}{2}\)

c)\(4-x=0=>x=4-0=4\)

d)\(=>2x=-1=>x=-\dfrac{1}{2}\)

Answer 2

e)\(=>x^2=-2\)=> x ko tồn tại

f)\(=>x\left(2+1\right)=0=>3x=0=>x=0\)