Question

Using a suitable algebraic identity, evaluate 205²-155²



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Answer 1

Answer:

hope it helps you mate

Step-by-step explanation:

18000

Answer 2

Answer:

18000

Step-by-step explanation:

step 1: Add 1 to the number excluding the unit digit.

step 2: Make square of the unit digit.

step 3: Multiply the number excluding the unit digit with the step 1 result.

(205)^2 - (155)^2

= 42025 - 24025

= 18000.