exam Maths Puzzle Numerical Ability

how do you simplify (x^(y+1)+z^2)(x^(y-1)-z^2)

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Hi,I need help multiplying these problems 1.158x73= 2.478x34= 3.97x46= 4.37x35= 5.486x28= 6.381x89= 7.827x98= 8.613x79= 9.724x47= 10.259x25= 11.4,235x73= 12.8,652x42= 13.9,845x68= 14.1,037x46= 15.6,472x29= 16.5,876x34= 17.6,825x47= 18.8,984x54= PLEASE !!!!!!!!!!!HELP !!!!!!!!!!!!!!!1

If a+b+c+d=45 and a+2=b-2=2c=d/2
FIND the values of a b c d PLEASEEEEEEEEEEEEEEEEE !!!!!!!!!! GOD BLESS YOU !!!!!!!