Question

Khai triển:

a) (x + 1)2 = 

b) (x - 2)2 =

c) (x + 8)2 =

d) (x - 2y)2 =

e) (5x + 3y)2 =

f) (3x - 7y)2 =

mấy số 2 là bình phương nhé

 

Answer 1

\(\left(x+1\right)^2=x^2+2x+1.\\ \left(x-2\right)^2=x^2-4x+1.\\ \left(x+8\right)^2=x^2+16x+64.\\ \left(x-2y\right)^2=x^2-4xy+y^2.\\ \left(5x+3y\right)^2=25x^2+30xy+9y^2.\\ \left(3x-7y\right)^2=9x^2-42xy+49y^2.\)

Answer 2

a) \(\left(x+1\right)^2=x^2+2x+1\)

b) \(\left(x-2\right)^2=x^2-4x-4\)

c) \(\left(x+8\right)^2=x^2+16x+64\)

d) \(\left(x-2y\right)^2=x^2-4xy+4y^2\)

e) \(\left(5x+3y\right)^2=25x^2+30xy+9y^2\)

f) \(\left(3x-7y\right)^2=9x^2-42xy+49y^2\)