exam Maths Puzzle Numerical Ability

Directions: Solve the Equation.

sqrt21-x = x-1

I am not sure if I have to get rid of the square roots in the beginning or try to formulate an equation first.

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exam Other Question
1) Describe the three possible relationships for two straight lines in the same plane.
2) What is the solution to a system of two equations represented by two parallel lines in t perform indicated operation and simplify completely..thanks
(x+10)(x^2+9x-8)

also
(8x^6+7x^3+3x)+(3x^6+5x^3+5x)