Question

Descompuneti folosind formulele de calcul prescurtat:
a) (x+y)²
b) (x+2)²
c) x²-1
d) (3x+1)²
e) (x-y)²​

Answer 1

a) x^2+2xy+y^2

b)x^2+4x+4

c)(x-1)×(x+1)

d)9x^2+6x+1

e)x^2-2xy+y^2

Answer 2

Răspuns:

a).(x+y)^2= x^2+ 2xy+ y^2

b).(x+2)^2= x^2 + 2*2*x + 2^2 = x^2+ 4x +4

c).x^2-1= x^2 -2+ 1

d). (3x+1)^2=3^2*x^2+ 2*3*x+ 1^2= 9x^2+ 6x+ 1

e). (x-y)^2= x^2-2xy + y^2