exam Maths Puzzle Numerical Ability

if cosy=-2/sqrt(5) and y is the second quadrant, find cos2y

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exam Other Question

Can you please help me with these exponential/logarithmic equations?
a) solve 2^x=14
b) solve 3^x+2=81
c) solve log(x+8)= 1 + log(x-10)
Thank you so much for your help. Can someone please help me factor this polynomial completely

25x^2+10x+4

Thank you

Sean