Question

Find the square of :
1: 2x - 3y + z
2: 3a - 2b - 5c
​

Answer 1

Answer:

(3a−2b−5c)

2

=(3a)

2

+(−2b)

2

+(−5c)

2

+(2×3a×−2b+2×(−2b)×(−5c)+2×−5c×3a)

=9a

2

+4b

2

+25c

2

−12ab+20bc−30ac

Answer 2

Answer:

(3a - 2b - 5c)^2 = (3a)^2 + ( - 2b)^2 + ( - 5c)^2 + (2 × 3a × - 2b + 2 × ( - 2b) × ( - 5c) + 2 × - 5c × 3a) = 9a^2 + 4b^2 + 25c^2 - 12ab + 20bc - 30ac

Step-by-step explanation:

(3a - 2b - 5c)^2 = (3a)^2 + ( - 2b)^2 + ( - 5c)^2 + (2 × 3a × - 2b + 2 × ( - 2b) × ( - 5c) + 2 × - 5c × 3a) = 9a^2 + 4b^2 + 25c^2 - 12ab + 20bc - 30ac