Odpowiedź:
[tex]p = \frac{(x + 2 + x - 4) \times ( x- 2)}{2} = \frac{(2x - 2)(x - 2)}{2} = \frac{ {2x}^{2} - 4x - 2x + 4}{2} = \frac{ {2x}^{2} - 6x + 4}{2} [/tex]
[tex] \frac{ ({2x)}^{2} - 6x + 4}{2} = ((2 \times 3.5)^{2} - 6 \times 3.5 + 4) = ({7}^{2} - 21 + 4) \div 2 = (49 - 21 + 4) \div 2 = 32 \div = 16[/tex]
