Question

Bai 1 :cho A(x)=2x^2-8x

tim nghiem A(x)

b,tim B(x) biet B(x)=A(x)-3x+2x^2

c,tim ngiem B(x)

Bai2

Cho ham so y=f(x)=x+1

cac diem sau diem nao thuoc do thi ham so :A(0;1).B(1/2;-1). C(-1/2;0)

Answer 1

a,\(2x^2-8x=0\)

\(2x\left(x-4\right)=0\)

\(\Leftrightarrow\left\{{}\begin{matrix}2x=0\\x-4=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0\\x=4\end{matrix}\right.\)

b,\(B\left(x\right)=\left(2x^2-8x\right)-\left(3x+2x^2\right)\)

\(=2x^2-8x-3x-2x^2\)

=\(-11x\)

c,\(-11x=0\)

\(\Rightarrow x=0\)

Answer 2

\(A\left(x\right)=2x^2-8x\)

\(\Rightarrow2x^2-8x=0\)

\(\Rightarrow x\left(2x-8\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}x=0\\2x=8\Rightarrow x=4\end{matrix}\right.\)

\(B\left(x\right)=-3x+2x^2\)

\(B\left(x\right)=2x^2-3x\)

\(2x^2-3x=0\)

\(\Rightarrow x\left(2x-3\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}x=0\\2x=3\Rightarrow x=\dfrac{3}{2}\end{matrix}\right.\)