Question

Dacă a la 2 +b la 2 = 13 şi a · b = -6, atunci (a – b)la 2 = …

Answer 1

$a^{2}$+$b^{2}$=13

a*b=-6

$(a-b)^{2}$=$a^{2}$+$b^{2}$-2a*b=13-2*(-6)=13+12=25

Answer 2

a²+b²=13

a×b= -6

(a-b)²=

=a²-2ab+b²=

=13-2×(-6)=

=13+12=25