book Maths Puzzle Numerical Ability

Please solve following quadratic equations using method completing the square:
x^2 + x = -1

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book Other Question

A motorboat goes 5 miles upstream in the same time it requires to go 7 miles downstream. The river flows at 2 miles per hours. What is the speed of the boat in still water? directions: find all the roots of each equation.

2x^3+3x^2-6x-9=0