book Maths Puzzle Numerical Ability

how do you graph f(x)=-2x^2

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book Other Question

5xsquare-3xy-2ysquare=0,0.5x+2y=6 Radical expressions
Three students were asked to simplify sqrt10 +sqrt50. Their answers were:
Sqrt10(1+sqrt5),
Sqrt10+5sqrt2, and
Sqrt2(5+sqrt5).
Which if any is correct?
Which is in simplest form?
Thanks so much