Question

Sabendo que a^2-b^2=16 e a+b=8,calcule o valor de a-b

Answer 1

${a}^{2} - {b}^{2} = (a + b)(a - b) = 16 \\ 8 \times (a - b) = 16 \\ (a - b) = \frac{16}{8} \\ a - b = 2$