The equation (M & # 178; - 4) x & # 178; + (M + 2) x + (M + 1) y = m + 5 about X is known? (2) What is the value of M?

The equation (M & # 178; - 4) x & # 178; + (M + 2) x + (M + 1) y = m + 5 about X is known? (2) What is the value of M?

1) If x is an unknown, then M & # 178; - 4 = 0 and M + 1 = 0, then M has no solution
If y is an unknown, then M & # 178; - 4 = 0, and M + 2 = 0, so m = - 2
To sum up, when m = - 2, the equation is one variable linear equation
2) If the equation is quadratic, then M & # 178; - 4 = 0, and M + 2 ≠ 0, so m = 2

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