Odpowiedź:
z.12
= 10 x³ + 6 x² + 2 x - 20 x² - 12 x - 4 - ( 3 x³ + 6 x² - 21 x - 42 ) =
= 7 x³ - 20 x² + 11 x + 38
========================
z.13
[tex]\frac{3 x + 5}{7} - 2 = \frac{4x + 1}{5}[/tex] / * 35
5*( 3 x + 5) - 70 = 7*( 4 x + 1)
15 x + 25 - 70 = 28 x + 7
15 x - 45 = 28 x + 7 / + 45
15 x = 28 x + 52 / - 28 x
- 13 x = 52 / : ( - 13)
x = - 4
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Odpowiedź:
z.12
= 10 x³ + 6 x² + 2 x - 20 x² - 12 x - 4 - ( 3 x³ + 6 x² - 21 x - 42 ) =
= 7 x³ - 20 x² + 11 x + 38
========================
z.13
[tex]\frac{3 x + 5}{7} - 2 = \frac{4x + 1}{5}[/tex] / * 35
5*( 3 x + 5) - 70 = 7*( 4 x + 1)
15 x + 25 - 70 = 28 x + 7
15 x - 45 = 28 x + 7 / + 45
15 x = 28 x + 52 / - 28 x
- 13 x = 52 / : ( - 13)
x = - 4
=======
Szczegółowe wyjaśnienie: