Question

Expand (4x – 5y + 6z)2
it's square not *2​

Answer 1

Step-by-step explanation:

(a+b+c)² = a² + b² + c² + 2(ab+bc+ac)

Using this formula in the ques,

(4x-5y+6z)² = (4x)² + (-5y)² + (6z)² +2[(4x*-5y) + (-5y*6z) + (6z*4x)]

= 16x² + 25y² +36z² +2( -20xy - 30yz + 24xz )

= 16x² + 25y² + 36z² -40xy - 60yz + 24xz