please slove all these for maths genius
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8) a) x²+1/x²=(x+1/x)²-2·x·1/x=(x+1/x)²-2=4²-2=14
b)x⁴+1/x⁴=(x²+1/x²)²-2·x²·1/x²=(x²+1/x²)²-2=14²-2=194
9) x²+1/x²-2=36
x²+1/x²=38
x⁴+1/x⁴=(x²+1/x²)-2=38²-2=1442
10) a) x²+1/x²=(x-1/x)²-2=5²-2=23
b) x⁴+1/x⁴=(x²+1/x²)²-2=23²-2=527
11) a) y²-y+7y-7=y²+6y-7
b) m²-8m-5m+40=m²-13m+40
c) z²-2z-8z+16=z²-10z+16
12)
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