Question

Evaluate without the actual multiplication
69²

Answer 1

${69}^{2} \\ = {(70 - 1)}^{2} \\ = {70}^{2} - 2 \times 70 \times 1 + {1 }^{2} \\ = 4900 - 140 + 1 \\ = 4761$

Answer 2

(70-1)2
using identity (a+b)2=a2 +B2 -2ab
a=70 b=1
(70)2+(1)2-2(70)(1)
4900+1-140
4901-140
4761
please mark me brainliest..