exam Maths Puzzle Numerical Ability

how can i factor x^2+4x+4-y^2

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exam Other Question

Solve for x:
a)(4^x)(2(^x+3))=16(^2x-5)
b) 2x-1(^1/2)+sqrt3
c) 8(^2x)+(8^x)-12=0
d) x+3(^2/3)=4
Can someone PLEASE help me with these ???? an alloy of metals is 20% copper. another alloy is 50% copper.how much of each should be used to make 1000 gram of an alloy that is 45% copper?