Question

89squar using suitable identity with work out

Answer 1

Answer:

7921

Step-by-step explanation:

${(89)}^{2}$

This can also be written as

${(100 - 11)}^{2}$

Using identity

${(a - b)}^{2} = {a}^{2} - 2ab + {b}^{2}$

a=100

b=11

${(100)}^{2} - (2 \times 100 \times 11) + {(11)}^{2}$

$10000 - 2200 + 121$

$7800 + 121$

$7921$