Odpowiedź :
A)
(x + 5) • (x - 2) = x^2 + 3x - 10
B)
1/2 • (x + 3) • (x - 3) = 1/2 • (x^2 - 9) = 1/2x^2 - 4,5
C)
1/2 • (x + x + 2) • (x + 1) =
1/2 • (2x^2 + 2x + 2x + 2) = x^2 + 2x + 1
(x + 5) • (x - 2) = x^2 + 3x - 10
B)
1/2 • (x + 3) • (x - 3) = 1/2 • (x^2 - 9) = 1/2x^2 - 4,5
C)
1/2 • (x + x + 2) • (x + 1) =
1/2 • (2x^2 + 2x + 2x + 2) = x^2 + 2x + 1