Question

tìm x:(3.x^2-15): 3= 59

Answer 1

\(\left(3x^2-15\right):3=59\)

\(3x^2-15=59\times3\)

\(3x^2-15=177\)

\(3x^2=177+15\)

\(3x^2=192\)

\(x^2=192:3\)

\(x^2=64\)

\(x=\pm8\)

Answer 2

=>(3x^2-15)=177

=>3x^2=192

=>x^2=64

=>x=8 hoặc x=-8