book Maths Puzzle Numerical Ability

n2 -8n +14 = 0

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book Other Question

Solve the following system.
1st by Addition
2nd by Substitution
0.2x + 0.37y = 0.8
-0.6x + 1.4y = 2.62

I am getting confused with addition and the substitution. I have three
complete the square, and find the roots of the quadratic equation.

x^2 - 2/3x = 0