Question

descompuneți în factori următoarele expresii , folosind formula : a^2-b^2=(a+b)(a-b)

a) x^2-36=
b)9x^2-64
c)100a^2-81b^2
d)25a^2-121b^2
e)x^2-4y^2
f)64x^2-81y^2​

Answer 1

x^2-36=(x+6)(x-6)

9x^2-64=(3x+6)(3x-6)

100a^2-81b^2=(10a+9b)(10a-9b)

25a^2-121b^2=(5a+11b)(5a-11b)

x^2-4y^2=(x+2y)(x-2y)

64x^2-81y^2=(8x+9y)(8x-9y)

Answer 2

a) (x+6)(x-6)

b) (3x-8)(3x+8)

c) (10a+9b)(10a-9b)

d) (5a+11b)(5a-11b)

e) (x-2y)(x+2y)

f) (8x-9y)(8x+9y)