Question

se dau nr . a si b
a² - b² = 12
a - b = 4
a + b = ?

ajutor e urgent si va rog nu faceti troll​

Answer 1

${a}^{2} - {b}^{2} = 12$

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

$(a + b)(a - b) = 12$

$a - b = 4$

$a + b = \frac{12}{4} = 3$

Answer 2

$a^2-b^2=12 =(a+b)(a-b) \\ a-b=4 \\ \Rightarrow a+b=\frac{12}{4}=\bpxed{3}$