Question

Using suitable identiry find : 42 square​

Answer 1

Answer:

(a+b)²

Step-by-step explanation:

(40+2)² = 1600+4+2(2)(40) = 1600+160+4 = 1764

Answer 2

Answer:

${42}^{2} = 1684$

${42}^{2} = {(40 + 2)}^{2}$

${(40 + 2)}^{2} = {40}^{2} + {2}^{2} + 2 \times 40 \times 2$

${(40 + 2)}^{2} = 1600 + 4 + 80$

${(40 + 2)}^{2} = 1684$