If \( a, b, c \in R, a \neq 0 \) and \( (b-1)^{2}4 a c \), then the number of real roots of the ... VIDEO
If \( a, b, c \in R, a \neq 0 \) and \( (b-1)^{2}4 a c \), then the number of real roots of the system of equation (in three unknowns \( x_{1} \), \( \left.x_{2}, x_{3}\right) \)https://bit.ly/YTAI_PWAP https://www.pw.live
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\[
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A=\left\{x: \frac{x+2}{x-4} \leq 0\right\}, B=\left\{x / x^{2}-a x-4 \leq 0\right\}
\]
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\[
\begin{array}{l}
x^{2}+b x-1=0 \\
x^{2}+x+b=0
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