Question

Wykonaj mnożenie.

a) (a+1)*(a-1) = ...
b) (4+x)*(x-8) = ...

Answer 1

A) (a+1)*(a-1) = a²-1
To jest wzór skróconego mnożenia: (a-b)(a+b)=a²-b²

b) (4+x)*(x-8) =4x - 32 + x²-8x = x²-4x-32

Answer 2

A) (a+1)*(a-1) = a²-1²
b) (4+x)*(x-8) = 4x-32+x²-8x=x²-4x-32

Answer 3

A) (a+1)*(a-1) = a²-a+a-1=a²-1
b) (4+x)*(x-8) =4x-32+x²-8x