Question

Solve no. 11 and 12 with process

Answer 1

3^x + 3^x = 162

⇒ 2 × 3^x = 162

⇒ 3^x = 162/2

⇒ 3^x = 81

⇒ 3^x = 3^4

⇒ x = 4

The value of x is 4.

( x + y - z )( x - y + z )

= x² - ( y - z )²

⇒ x² - y² - z² + 2 yz

Verification :

x = - 1

y = 2

z = 1

( x + y - z )( x - y + z )

⇒ ( - 1 + 2 - 1 )( - 1 - 2 + 1 )

⇒ ( 0 ) ( - 2 )

⇒ 0

x² - y² - z² + 2 yz

⇒ 1 - 4 - 1 + 2 ( - 2 )( 1 )

⇒ - 4 + 4

⇒ 0

Answer 2

hi

here is your answer

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