Question

(z+3) (z-3) -z (z+5) = 5

Answer 1

$(z + 3)(z - 3) - z(z - 5) = 5 \\ ( {z }^{2} - {3}^{2} ) - {z}^{2} + 5z = 5 \\ {z}^{2} - 9 - {z}^{2} + 5z = 5 \\ - 9 + 5z = 5 \\ 5z = 5 + 9 \\ 5z = 14 \\ z = 14 \div 5 \\ z = 2.8$