book Maths Puzzle Numerical Ability

Find the equation of the line joining the points
(─5, 2, 3) and (5, ─ 2, 3).

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book Other Question

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

Thanks Caroline
please help me in this question......

2.8*10^4+3.2*10^5