Question

Answer 1

để \(A\left(x\right)=0\)

\(=>2x-5=0\)

\(=>x=\left(0+5\right):2=\dfrac{5}{2}\)

để\(A\left(x\right)=-3\)

\(=>2x-5=-3\)

\(2x=-3+5\)

\(2x=2\)

\(x=2:2=1\)

để \(A\left(x\right)=4\)

\(=>2x-5=4\)

\(=>2x=4+5\)

\(2x=9\)

\(x=9:2=\dfrac{9}{2}\)

 

Answer 2

+A(x)=0 <=>2x-5=0<=>x=5/2

+A(x)=-3 <=>2x-5=-3<=>x=1

+A(x)=-4 <=>2x-5=4<=>x=2/9