Question

evlauate eaxh of the following using suitable identities (y+0.3) (y - 0.3) if y square is equal to 1​

Answer 1

Answer:

Step-by-step explanation:

we can use the identity [a+b][a-b]=a^2-b^2 here the a is y and b is 0.3

[y+0.3][y-0.3]=y^2-[0.3]^2

                    =>y^2-0.09

                    =>1^2-0.09

                    =>1-0.09

                    =>0.01

Answer 2

Answer:

0.91

Step-by-step explanation:

Given:-

y²=1⇒y=√1⇒y=1

To Find:-

(y+0.3)(y - 0.3)

Formula/Identity Applied:-

a²-b²=(a+b)(a-b)

Solution:-

(y+0.3) (y - 0.3)

y=1 (given)

(1+0.3)(1-0.3)

(1)²-(0.3)²

1-0.09

0.91