Question

Use expansion formula and find value; (38)²​

Answer 1

Answer:

(40-2)²

(a-b)²=a²+b²-2ab

(40)²+(2)²-2×40×2

1600+4-160

1604-160

1444

Answer 2

$= ( {40 - 2)}^{2}$

$= {a}^{2} + {b}^{2} - 2ab$

$= {40}^{2} + {2}^{2} - 2 \times 40 \times 2$

$= 1,600 + 4 - 160$

$= 1,444$