Question

Sa se calculeze a²+b², stiind ca numerele a si b au suma egala cu 7 si produsul egal cu 12.

Answer 1

$a^2+b^2=(a+b)^2 -2ab \\\\ a^2+b^2= 7^2 - 2* 12 \\\\\ a^2+b^2=49-24 \\\\\\ \boxed{a^2+b^2=25}$