book Maths Puzzle Numerical Ability

Find the real solution, if any. Use quadratic formula and calculator.
x^2+sqrt2x-2=0

Thanks Caroline

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book Other Question

2a=3b-13
b=2a+7

Use substitution method to solve system .
If system is dependant or inconsistant so indicate. what would a graph look like for x-y=-3??
please help me and thanks for the help
=)