Question

find the value of 105 square -100square by suitable identity ​

Answer 1

Answer:

${105}^{2} - {100}^{2} \\ = (105 + 100) \times (105 - 100) \\ = 205 \times 5 = 1025$

Answer 2

a^2-b^2= (a+b)(a-b)

so, (105+100) (105-100)

• 205×5
• 1025