exam Maths Puzzle Numerical Ability

What are the zeroes of this polynomial if b=-2: f(x)=x^2+2x+2b+bx?

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exam Other Question

Prove the sequence (sin (npi/4)) is divergent. Please help me pick the correct answer.

If x-y=6 and 3x^2+3xy-6y^2=60, then 9x+18y=

Answers:
a) 12
b) 15
c) 20
d) 24
e) 30