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a²-22a+121 this given expression is a perfect square or not

Sagot :

Answer:

a^2-22a+121 = (a-11) (a-11)

Step-by-step explanation:

Let's factor a2−22a+121

a2−22a+121

The middle number is -22 and the last number is 121.

Factoring means we want something like

(a+_)(a+_)

Which numbers go in the blanks?

We need two numbers that...

Add together to get -22

Multiply together to get 121

Can you think of the two numbers?

Try -11 and -11:

-11+-11 = -22

-11*-11 = 121

Fill in the blanks in

(a+_)(a+_)

with -11 and -11 to get...

(a-11)(a-11)

I hope it helps,

Correct me if I'm wrong