Question

bài 3 : khai triển biểu thức sau

a , ( x mũ 2 + 2 ) mũ 2

b , ( x + y + z ) mũ 2

Answer 1

a) (x² + 2)²

= (x²)² + 2.x².2 + 2²

= x⁴ + 4x² + 4

b) (x + y + z)²

= [(x + y) + z]²

= (x + y)² + 2(x + y).z + z²

= x² + 2xy + y² + 2xz + 2yz + z²

= x² + y² + z² + 2xy + 2xz + 2yz

Answer 2

sos

Answer 3

a,

   (\(x^2\) + 2)² 

= (\(x^2\))² + 2.\(x^2\).2 + 2² 

= \(x^4\) + 4\(x^2\) + 4

b, (\(x\) + \(y\) + z)²

=  (\(x\) + y)² + 2(\(x+y\))z + z²

= \(x^2\) + 2\(xy\) + y² + 2\(xz\) + 2yz + z²

 

Answer 4

a) \(\left(x^2+2\right)^2=\left(x^4+4x^2+4\right)\)

b) \(\left(x+y+z\right)^2=x^2+y^2+z^2+2xy+2yz+2xz\)