What is the formula of (a+b)² and (a-b)²
?​

Step-by-step explanation:

These are identities .

( a + b)²

( a + b) ( a + b)

a ( a + b ) + b ( a + b)

a² + ab + ab + b²

a² + 2ab + b²

( a - b)²

( a - b) ( a - b)

a ( a - b ) - b ( a - b)

a² - ab - ab + b²

a² - 2ab + b²

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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12cm

the answer is d