Step-by-step explanation:
[tex] {p}^{2} + 2pq - 3 {q}^{2} [/tex]
[tex]( \frac{1}{4} {)}^{2} + 2( \frac{1}{4} )( \frac{2}{3} ) - 3( \frac{2}{3} {)}^{2} [/tex]
[tex] \frac{1}{16} + \frac{1}{ 3} - \frac{4}{3} [/tex]
[tex] \frac{ - 15}{16} [/tex]
