Wykonaj mnożenie i zredukuj wyrazy podobne.
I. (3x+2)(3x-2)+2x "do potęgi drugiej"
II. (-5a-7)(3a+b) + a "do potęgi drugiej" -b= -14___-_____a-_____b-_____ab
III. (-8a - 4)(-3a-9) -11a + a "do potęgi drugiej"
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I. 9x^{2} + 2x^{2} = 11x^{2}
II. -15a^{2}-15ab-21a-7b + a^{2} - b= 14a^{2}- 21a-8b- 15ab
III. 24a^{2}+72a+12a+36-11a+a^{2} = 25a^{2}+73a+36
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