Question

ayuda por favor. Gracias

Answer 1

$f(x) = 3 {(x + \frac{2}{3}) }^{2} - \frac{25}{3} \\ = 3( {x}^{2} + 2 \times x \times \frac{2}{3} + \frac{4}{9} ) - \frac{25}{3} \\ = 3( {x}^{2} + \frac{4x}{3} + \frac{4}{9} ) - \frac{25}{3} \\ = 3 {x}^{2} + 4x + \frac{4}{3} - \frac{25}{3} \\ = 3 {x}^{2} + 4x - \frac{ 21}{3} \\ = 3 {x}^{2} + 4x - 7$