Question

Решите 13 дам баллов​

Answer 1

${49a}^{2} - \frac{1}{16} {b}^{4} = \\ {(7a)}^{2} - ( \frac{1}{4} b ^{2} ) ^{2} = \\ (7a - \frac{1}{4} {b}^{2} )(7a + \frac{1}{4} {b}^{2} )$