Question

Answer 1

Bài 4 :

a) \(f\left(-2\right)=3\)

\(\left(1\right)\Leftrightarrow\left(4m+12\right).\left(-2\right)-m=3\)

\(\Leftrightarrow-8m-24-m=3\)

\(\Leftrightarrow9m=-27\)

\(\Leftrightarrow m=3\)

b) \(f\left(3\right)=-8\)

\(\left(1\right)\Leftrightarrow\left(4m+12\right).3-m=-8\)

\(\Leftrightarrow12m+36-m=-8\)

\(\Leftrightarrow11m=-44\)

\(\Leftrightarrow m=-4\)

Bài 5 :

Phương trình hoành độ giao điểm của \(\left(d\right)\&\left(d'\right):\)

\(2x-3=x+1\)

\(\Leftrightarrow x=4\)

\(\Rightarrow y=2x-3=2.4-3=5\)

Vậy \(A\left(4;5\right)=\left(d\right)\cap\left(d'\right)\)