2x-y при x=1,5;y=2 (x-y)*(x+y)при 0,5*y=0,15

Question

2x-y при x=1,5;y=2

(x-y)*(x+y)при 0,5*y=0,15

Answer 1

2x-y = 2*1,5 - 2 = 3 - 2 = 1
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(x-y)*(x+y)=(0,5-0,15)*(0,5+0,15)=0,35*0,65=0,2275