`#Sad`
`1)`
`R= 6(x-2)^2+(3x-1)^2`
`= 6(x^2-4x+4)+9x^2-6x+1`
`= 6x^2-24x+24+9x^2-6x+1`
`= 15x^2-30x+25`
`= 5(3x^2-6x+5)`
`\text{Thay}` `x=3` `\text{vào ta có:}`
`R= 5. (3. 3^2-6. 3+5)`
`= 5. 14`
`= 70`
`2)`
`P= (2x-3)(4x^2+6x+9)+(2x+1)^3`
`= 8x^3-27+8x^3+12x^2+6x+1`
`= 16x^3+12x^2+6x-26`
`= 2(8x^3+6x^2+3x-13)`
`\text{Thay}` `x=1` `\text{vào ta có:}`
`P= 2. (8. 1^3+6. 1^2+3. 1-13)`
`= 2. 4`
`= 8`
