Sum
Factorise x3 + 6x2 + 11x + 6 completely using factor theorem.
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Solution
`"Let" f(x)=x^3+6x^2+11x+6 `
`for=x=-1 `
`f(-1)=(-1)^3+6(-1)^2+11(-1)+6`
`=-1+6-11+6=12-12=0 `
Hence, (x+1) is a factory of f(x)
∴ `x^3+6x^2+11x+6=(x+1)(x^2+5x+6) `
=`(x+1)(x^2+2x+3x+6) `
=`(x+1)[x(x+2)+3(x+2)] `
=`(x+1)(x+2)(x+3)`
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