Question

Giải giúp mình bài này với ạ

Answer 1

\(15x-9x^2-25+15x+9x^2+18x+9-30=0\)

\(48x-46=0\)

\(x=\dfrac{46}{48}=\dfrac{23}{24}\)

\(x^2+8x+16-x^2+1-16=0\)

\(8x+1=0\)

\(x=\dfrac{-1}{8}\)

Answer 2

a) \(\Leftrightarrow15x-9x^2-25+15x+9x^2+18x+9=30\)

\(\Leftrightarrow23x=46\)

\(\Leftrightarrow x=2\)

b) \(\Leftrightarrow x^2+8x+16-x^2+1=16\)

\(\Leftrightarrow x=-\dfrac{1}{8}\)