Question

a. (3x +4) ÷hết(x-3) (x khác 3 )

b. (x^{2 +} 3x -13) ÷hết (x khác -3 )

C.(x² +3) ÷hết (x-1) (x khác 1)

d. (x² +2 -11) ÷ hết x+2 (x khác 2)

 

 

Answer 1

a: \(\Leftrightarrow3x-9+13⋮x-3\)

\(\Leftrightarrow x-3\in\left\{1;-1;13;-13\right\}\)

hay \(x\in\left\{4;2;16;-10\right\}\)

b: \(\Leftrightarrow x\left(x+3\right)-13⋮x+3\)

\(\Leftrightarrow x+3\in\left\{1;-1;13;-13\right\}\)

hay \(x\in\left\{-2;-4;10;-16\right\}\)

c: \(\Leftrightarrow x^2-1+4⋮x-1\)

\(\Leftrightarrow x-1\in\left\{1;-1;2;-2;4;-4\right\}\)

hay \(x\in\left\{2;0;3;-1;5;-3\right\}\)