Question

Daca a^2-b^2=36 si a-b=9, aflati a+b HAI REPEDE VA ROGG

Answer 1

a^2-b^2=(a-b)(a+b)=36
a-b=9 => a+b=4

Sistem de ecuatii:
a-b=9
a+b=4
----------   (+)
2a=13 => a=13/2
b=4-a => b=4-13/2=(8-13)/2=-5/2