**Question 1:**
Complete the square: ${x}^{2}-12x+18$

**Question 2:**
Complete the square: $3{x}^{2}-15x+21$

**Question 3:**
Complete the square: $2{x}^{2}+7x+13$

**Question 4:**
Find the sum of the roots of the quadratic equation: ${x}^{2}-15x+2.5=0$

**Question 5:**
Find the sum of the roots of the periodic equation: $3{x}^{2}-4x+5=0$

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