Question

9x^2-30x+25+6x-10

Answer 1

\(9x^2-30x+25+6x-10=\left(9x^2-30x+25\right)+\left(6x-10\right)\)

\(=\left(3x-5\right)^2+2\left(3x-5\right)=\left(3x-5\right)\left(3x-5+2\right)=3\left(3x-5\right)\left(x-1\right)\)

Answer 2

\(=9x^2-24x+15=9x^2-9x-15x+15\\ =9x\left(x-1\right)-15\left(x-1\right)\\ =3\left(3x-5\right)\left(x-1\right)\)

Answer 3

     \(9x^2-30x+25+6x-10\)

⇔  \(9x^2-24x+15\)