Question

205² evaluate by applying identity algebraic expression​

Answer 1

Answer:

42025

Step-by-step explanation:

See the pic attached

Hope it helps you

Answer 2

Solution:

$(205)²$

$⟹(200+5)²$

$⟹(200)²+(5)²+2(200)(5)$

$⟹40,000+25+2(1,000)$

$⟹40,025+2,000$

$⟹42,025$

Identity, which we used:

(a + b)² = a² + b² + 2ab

༄Extra Points:

(a - b)² = a² + b² -2ab

(a + b)³ = a³ + b³ + 3ab(a + b)

(a - b)³ = a³ - b³ - 3ab(a - b)