Wykonaj mnożenie i zredukuj wyrazy podobne. a) (3x+2)(3x-2)+2x²= ? b) (-5a-7)(3a+b)+a²-b= ? c) (-8a-4)(-3a-9)-11a+a²= ? proszę tylko szybko

a) (3x+2)(3x-2)+2x²= 9x²-4+2x²=11x²-4 b) (-5a-7)(3a+b)+a²-b= -15a²-5ab-21a-7b+a²-b= -14a²-5ab-21a-8b c) (-8a-4)(-3a-9)-11a+a²= 24a²+72a+12a+36-11a+a²=25a²+73a-11a+36

a) (3x+2)(3x-2)+2x²= 9x²+6x-6x-4+2x²=11x²-4 b) (-5a-7)(3a+b)+a²-b= -15a²-21a-5ab-7b+a²-b=-14a²-8b-21a-5ab c) (-8a-4)(-3a-9)-11a+a²=24a²+12a+72a+36-11a+a²=25a²+73a+36