Question

Ayudda x favor

Si: a - b = 8 ; ab = 4 Hallar : a²+ b²

Answer 1

Respuesta:

$(a-b)^{2} =8^{2} \\a^{2}-2ab+ b^{2} =64\\a^{2}+b^{2}=64+2(ab)\\a^{2}+b^{2}=64+2(4)\\a^{2}+b^{2}=72$