Question

use expansion formula to find the value 102sq​

Answer 1

Step-by-step explanation:

answer is 10404.formula is (a+b)2 = a2 +2ab+b2

Answer 2

Step-by-step explanation:

$(102) {}^{2} = (100 + 2) {}^{2} \\( x + y) {}^{2} = {x}^{2} + {y}^{2} + 2xy \\ 100 {}^{2} + 2 {}^{2} + 2 \times 2 \times 100 \\ = 10000 + 4 + 400 \\ = 10404$