Question

Si m²+n²=5 y mn=2, halla m+n

Answer 1

productos notables, binomio al cuadrado

$(m + n) {}^{2} = {m}^{2} + 2mn + {n}^{2}$

$(m + n) {}^{2} = 5 + 2 \times 2$

$(m + n) {}^{2} = 9$

m+n= 3

m+n= -3