Question

find the square without multiplication :- (99)²
k.c nag class 7 sum
quadratic algebra ​

Answer 1

Step-by-step explanation:

$(99) {}^{2} \\ also \: used \: this \: formula \: down \: below \\ (x - y) {}^{2} = x {}^{2} + y {}^{2} - 2xy \\ = (99) { }^{2} = (100 - 1) {}^{2} \\ (100 - 1) {}^{2} = (100) {}^{2} + (1) {}^{2} - 2 \times 100 \times 1 \\ = 10000 + 1 - 200 \\ = 10001 - 200 \\ = 9801$