Question

1.Completati :
a) (x-1)²
b) (x+2)²
c) (x-3)²
d) (2x+3)²
e) (4x-1)²
f) (8x+3)²
g) (x+2)•(x-2)
h) (2x+3)•(2x-3)
i) (3x+1)•(3x-1)

Answer 1

Trebuie sa aplici formulele:
(a-b)²=a²-2ab+b²
(a+b)²=a²+2ab+b²
a²-b²=(a-b)(a+b)



a) (x-1)²=x²-2x+1
b) (x+2)²=x²+4x+4
c) (x-3)²=x²-6x+9
d) (2x+3)²=4x²+12x+9
e) (4x-1)²=16x²-8x+1
f) (8x+3)²=64x²+48x+9
g) (x+2)•(x-2)=x²-2²=x²-4
h) (2x+3)•(2x-3)=4x²-9
i) (3x+1)•(3x-1)=9x²-1