Question

Factorise 18 a square - 50

Answer 1

Answer:

18 square =324

18 square _50

324_50=274

Answer 2

Answer:

$18 {a}^{2} - 50 \\ = { (\sqrt{18}a) }^{2} - ( { \sqrt{50} })^{2} \\ = ( \sqrt{18} a - \sqrt{50})( \sqrt{18} a + \sqrt{50} ) \\ = (3 \sqrt{2} a - 5 \sqrt{2} )(3 \sqrt{2} a + 5 \sqrt{2} ) \\ = \sqrt{2} (3a - 5) \sqrt{2} (3a + 5) \\ = \sqrt{2} (3a - 5)(3a + 5)$