exam Maths Puzzle Numerical Ability

Can someone please help me factor this polynomial completely

25x^2+10x+4

Thank you

Sean

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exam Other Question

if cosy=-2/sqrt(5) and y is the second quadrant, find cos2y I really need help with these questions.

Evaluate each function for x= -2,0,and 5.

1.) y = 9 + x

2.) y = x^2 - 1

Please help me because I need to get this to my teacher tommorrow.