Respuesta :

myca
10x^2-10x+20 is the answer to this
F - Firsts - 5x * 2x = 10x^2
O - Outers - 5x * -4 = -20x
I - Inners - -5 * 2x = -10x
L - Lasts - -5 * -4 = 20
Add the Outers and Inners -20x + -10x = -30x
Put them together - 10x^2 -30x +20