Question

. Find the value of the expression a2 – 2ab + b2 for a = 2, b = -1.

Answer 1

Answer:

the answer is 6

Step-by-step explanation:

2×2-2×2×(-1)+(-1)×2 = 4-(-4)+(-2) = 8+(-2) = 6

Answer 2

Answer:

= a² - 2ab + b²

= (a-b)²

a=2

b=-1

By substituting,

= [2-(-1)]²

= (2+1)²

= 3²

= 9

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