exam Maths Puzzle Numerical Ability

I need help completing the square of this quadratic equation. Thanks.

x^2 + 16x = 0

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exam Other Question

a principal walks in and said I am 4 times the age of my grandson and my son is 11 years younger than my daughter and my daughter is 30 years older than my grandson .. all of our ages equal 196..how old is the principal???? A student scores 79 on an exam containing 100 problems. He tried to solve all the problems. His score was figured by subtracting two times the number of wrong answers from the number of correct answers. How many problems did he answer correctly?