\(2.\)
\(c.7\left(3x-2\right)-15\left(x-2\right)+10\)
\(=21x-14-15x+10+10\)
\(=6x+6\)
\(d.\left(x-1\right)\left(3+x\right)+2x\left(x-3\right)+1\)
\(=3x+x^2-3x-x+2x^2-6x+1\)
\(=3x^2-4x+1\)
\(c.\\ \\ \\ 7\left(3x-2\right)-15\left(x-2\right)=10\\ \\ \\ =21x-14-\left(15x-30\right)\\ \\ \\ =21x-14-15x+30\\ \\ \\ =\left(21x-15x\right)+\left(-14+30\right)=6x+16\\ \\ \\ d.\\ \\ \\ \left(x-1\right)\left(3+x\right)+2x\left(x-3\right)+1\\ \\ \\ =3x+x^2-3-x+2x^2-6x+1\\ \\ \\ =\left(x^2+2x^2\right)+\left(3x-x-6x\right)-\left(3-1\right)\\ \\ \\ =3x^2+\left(-4x\right)-2=3x^2-4x-2\)
`c,7(3x-2) - 15(x-2)+10`
`= 21x- 14 -15x + 30 + 10`
`= 6x + 26`
d,(x-1)(3+x) + 2x(x-3)+1`
`= 3x + x^2 - 3 - x +2x^2 - 6x +1`
`= 3x^2 - 4x -2`
