Question

calculati valoarea expresiei:
a-b,stind ca a+b=4 si  $a^{2} -b^{2}$=12

Answer 1

a=4-b
(4-b)²-b²=12
16-b²-b²=12
-2b²=-4
b²=2
b=√2
4-√2-√2= 4-2√2