Wykonaj mnożenie sum algebraicznych
a) ( 3a + 4) (a - 5) = b) (3x + 3) (4x - 2) = c) (4x - 2) (2x - 6) = d) (x + 5y) (7x - y) =
źródło:
(3a+4)(a-5)=3a^2-15a+4a-20=3a^2-11a-20 (3x+3)(4x-2)=12x^2-6x+12x-6=12x^2+6x-6 (4x-2)(2x-6)=8x^2-24x-4x+12=8x^2-28x+12 (x+5y)(7x-y)=7x^2-xy+35xy-5y^2=7x^2+34xy-5y^2