Question

b la puterea 4 - a la puterea 2 totul supra
a la putere 2 - ba puterea 2

Answer 1

$\frac{(b ^{2} -a ^{2}) }{a ^{2}-b ^{2} } = \frac{(b -a)(b +a) }{(a-b)(a+b)} = \frac{-(a-b)}{(a-b)} =-1$