Question

x^3 - 9x^2=x^3 -9x^2+2x -3

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Answer 1

\(x^3-9x^2=x^3-9x^2+2x-3\)

⇔\(x^3-x^3-9x^2+9x^2-2x=-3\)

⇔\(-2x=-3\)

⇔\(x=\dfrac{3}{2}\)

Answer 2

`x^3 -9x^2 =x^3 -9x^2 +2x-3`

`=> x^3 -9x^2-x^3 +9x^2 -2x+3=0`

`=> (x^3-x^3) +(-9x^2+9x^2)-2x+3=0`

`=> -2x-3=0`

`=>-2x=-3`

`=>x=3/2`