Question

57×63 with formula maths​

Answer 1

Step-by-step explanation:

57 = 60 - 3

63 = 60 + 3

57 × 63 = (60 - 3)(60 + 3)

It is in form of identity

$(a - b)(a + b) = {a}^{2} - {b}^{2}$

Here a = 60, b = 3

$= {60}^{2} - {3}^{2}$

$= 3600 - 9$

$= 3591$

Answer 2

Answer:

57 = 60 - 3

63 = 60 + 3

57 × 63 = (60 - 3)(60 + 3)

It is in form of identity

(a - b)(a + b) = {a}^{2} - {b}^{2}(a−b)(a+b)=a2−b2

Here a = 60, b = 3

= {60}^{2} - {3}^{2}=602−32

= 3600 - 9=3600−9

= 3591=3591