Answer
i. The answer is $x^{2}$ + $2x$ + $1$ or $(x+1)^{2}$.
The other answer (11 *11) is 121.
ii. The answer is $x^{2}$ + $3x$ + $2$.
The other answer is (11*12) is 132.
iii. The answer is $x^{2}$ + $4x$ + $3$.
The other answer is (11*13) is 143.
Work Step by Step
i. You have to multiply (x + 1)(x + 1) and you get $x^{2}$ + $2x$ + $1$ and $(x+1)^{2}$. For the other answer, it's the same thing; you multiply 11*11 = 121.
ii. You have to multiply (x + 1)(x + 2) and you get $x^{2}$ + $3x$ + $2$. For the other answer, it's the same thing; you multiply 11*12 = 132.
iii. You have to multiply (x + 1)(x + 3) and you get $x^{2}$ + $4x$ + $3$. For the other answer, it's the same thing; you multiply 11*13 = 143.
