Question

find the square root of 405 by using identity​

Answer 1

Answer:

Hey mate, Good evening ❤

#Here's ur answer..☆☆☆

Step-by-step explanation:

$\boxed{ \huge{ \mathfrak{ \pink{answer...}}}}$

$\red{ \bold{given \: \: (405) {}^{2} }} \\ = (400 + 5) {}^{2} \\ by \: using(a + b) {}^{2} = {a}^{2} + 2ab + {b}^{2} \\ = {400}^{2} + 2 \times 400 \times 5 + {5}^{2} \\ = 160000 + 4000 + 25 \\ \bold{ \green{ = 164025}} (\blue{answer...})$

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