Question

a x b = 8 a(2) + b(2) =20 hallar a+b

Answer 1

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

$( {a + b})^{2} = 20 + 2(8) \\ ( {a + b})^{2} = 36 \\ ( a + b) = \sqrt{36 } \\ (a + b) = 6$