Question

Using identities to evaluate
(i) 72^2​

Answer 1

Answer:

5184

Step-by-step explanation:

You times 72 by itself. You can break it down however. Like (70*70)+(70*2)2+(2*2). First we have 70 times 70. This can also be broken down into 7 times 7, which is 49 and then you move the decimal to the right twice to get 4900. Next, we have 70 times 2 which again can be broken down into 7 times 2 which equals 14 and then you move the decimal over once to get 140. Then finally 2 times 2 which is 4. Then we add it all up, 4900+140+140+4. Now 140+140=280, 280+4=284, and finally 4900+284=5184. There you have it.