Question

(y + 3) (y – 3) – y (y + 5) = 6, then y =

Answer 1

Answer:

Step-by-step explanation:

( y + 3 ) ( y - 3 ) - y (y + 5 ) = 6

⇒ y² - 3² - y² - 5y = 6 ( ∵ (a +b ) (a - b) = a²- b² ; - × + = - )

⇒ - 5y - 9 = 6 ( ∵ y²- y² = 0 )

⇒ - 5y = 6 + 9 ( ∵transposing )

⇒ - 5y = 15

⇒ y = 15 / (- 5 ) ( ∵ transposing )

⇒ y = - 3 is theanswer.