Question

ayudenme por favor es del tema de productos notables doy 40 puntos​

Answer 1

Respuesta:

$ab + bc + ac = 9\\ {a}^{2} + b {}^{2} + {c}^{2} = 18 \\ (a + b + c) {}^{2} = {a}^{2} + {b}^{2} + {c}^{2} + 2(ab + bc + ac) \\ ( a+b + c ) {}^{2} = 18 + 2(9) \\ (a + b + c) {}^{2} = 36 \\ \sqrt{(a + b + c)} {}^{2} = \sqrt{36 } \\ a + b + c = 6$