Question

please send me the answer ​

Answer 1

Answer:

i) (3x + 6)² - (3x - 6)²

={ (3x + 6 ) + (3x - 6) } {(3x + 6) - (3x - 6)}

= (3x + 6 + 3x - 6)(3x + 6 - 3x + 6)

= (6x )( 12)

= 72x

hope it helps you!!

Answer 2

Answer:

i) ( 3x + 6 )² - (3x - 6)²

Solution:

Identity: ( x + y)² = x² + 2xy + y²

( x - y)² = x² -2xy + y²

so,

[ (3x)² + 2 × 3x × 6 + (6)²] - [(3x)² -2×3x × 6 + (6)²]

[ 9x² + 36x + 36 ] - [ 9x² -36x + 36 ]

9x² +36x + 36 - 9x² + 36x - 36

72x

Therefore answer is 72x.

ii) 103 × 104

Solution :

(100 + 3) (100 + 4)

Identity : ( x + a) ( x + b) = x² + (a + b)x + ab

(100)² + ( 3 + 4)100 + 3 × 4

10000 + (12)100 + 12

10000 + 1200 +12

11212

Therefore answer is 11212...