Question

what is the value of (2+5) (2-5)​

Answer 1

Using

(a+b)(a-b) = a^2 - b^2

We write,

(2+5)(2-5)

= 2^2 - 5^2

=4-25

= -21   (Answer)

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Answer 2

Answer:

(2+5)(2-5)=-21

Step-by-step explanation:

(2+5)(2-5)

   ↑     ↑

They are in the form of (a+b)(a-b)

And we know that (a+b)(a-b)=a²-b²

a²=(2)²

b²=(5)²

(2+5)(2-5)=(2)²-(5)²

                =4-25

                =-21

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