Question

rezolvati ecuatia (3/8•x-9/16)•(x-4/5)

Answer 1

$( \frac{3}{8} x - \frac{9}{16} ) \times (x - \frac{4}{5} ) = \\ = \frac{3}{8} {x}^{2} - \frac{12}{40} x - \frac{9}{16} x + \frac{36}{80} = \\ = \frac{3}{8} {x}^{2} - \frac{3}{10} x - \frac{9}{16} x + \frac{9}{20} = \\ = \frac{30 {x}^{2} - 24x - 45x + 36 }{80} = \frac{30 {x}^{2} - 69x + 36 }{80} = \\ = \frac{30 {x}^{2} - 69x + 9 }{20}$
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