Đáp án:
`e)x-5=(sqrtx)^2-(sqrt5)^2`
`=(sqrtx-sqrt5)(sqrtx+sqrt5)`
$\\$
`d)5-7x^2=7(5/7-x^2)`
`=7(\sqrt{5/7}-x)(\sqrt{5/7}+x)`
`f)3+4x`
`=3-(-4x)`
`=(sqrt3-\sqrt{-4x})(sqrt3+sqrt{-4x})(do\ x<0)`
$\begin{array}{l} x - 5 = \left( {\sqrt x - \sqrt 5 } \right)\left( {\sqrt x + \sqrt 5 } \right)\\ 5 - 7{x^2} = \left( {\sqrt 5 - x\sqrt 7 } \right)\left( {\sqrt 5 + x\sqrt 7 } \right)\\ 3 + 4x = 3 - 4\left( { - x} \right) = \left( {\sqrt 3 - 2\sqrt { - x} } \right)\left( {\sqrt 3 + 2\sqrt { - x} } \right)\left( {x < 0 \Rightarrow - x > 0} \right) \end{array}$
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phân tích đa thức thành nhân tử b^2c+bc^2+ac^2-a^2-ab(a+b) x^2(x^2-6)-x^2+9 a(x-y)+bx-by +y(a-b)-2a+2b
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