Question

(y+9)(y+9). what is answer pls give​

Answer 1

EXPLANATION.

Factorizes : (y + 9)(y + 9).

⇒ y(y + 9) + 9(y + 9).

⇒ y² + 9y + 9y + 81.

⇒ y² + 18y + 81.

We can write equation as,

⇒ (y + 9)² = y² + 18y + 81.

                                                                                                                     

MORE INFORMATION.

(1) = (x + y)² = x² + y² + 2xy.

(2) = (x - y)² = x² + y² - 2xy.

(3) = (x² + y²) = (x + y)² - 2xy.

(4) = (x² - y²) = (x + y)(x - y).

(5) = (x + y)³ = x³ + 3x²y + 3xy² + y³.

(6) = (x - y)³ = x³ - 3x²y + 3xy² - y³.

(7) = (x³ + y³) = (x + y)(x² - xy + y²).

(8) = (x³ - y³) = (x - y)(x² + xy + y²).

Answer 2

Answer:

(a+b)(a-b)=a²-b²

so the product is (y+9)(y-9)is y²-9² = y²-81