Toán Lớp 8: giải pt (x + 3). (x+ 5) = (x+ 4). (2+ x)
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Toán Lớp 8: giải pt (x + 3). (x+ 5) = (x+ 4). (2+ x)
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\;\left( {x + 3} \right).\left( {x + 5} \right) = \left( {x + 4} \right).\left( {2 + x} \right)\\
\Leftrightarrow {x^2} + 5x + 3x + 15\\
\Leftrightarrow 2x + {x^2}2 + 8 + 4x\\
\Leftrightarrow {x^2} + 5x + 3x – 2x – {x^2} – 8 – 15\\
\Leftrightarrow 6x = – 7\\
\Leftrightarrow x = \frac{{ – 7}}{6}
\end{array}\]