Question

The value of 85 x 85 - 15 x 15 is *

Answer 1

Step-by-step explanation:

85×85 -15×15 can be solved in such way

we can write 85× 85 as 85² same as 15 × 15²

85²-15² ( a²-b² = {a+b}{a-b} )

so (85+15)(85-15 )

100×70

=7000

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