book Maths Puzzle Numerical Ability

Find if the triangle is acute or obtuse from the sides of given length
1)5,8,9
2)24,8,(35
3)2(10,7,3

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book Other Question
2a+7/(8a^2-2a-1) + a-4/(2a^2+5a-3) = 4a-1/(4a^2+13a+3) Perform the indicated division

x^2 + 5x + 6

divided by

x + 2