Question

EXPAND THIS = (42k + 36n - 42k)²
FAST........

Answer 1

Hey dude ✌ ✌


Here is your answer ↘↘↘↘↘


We have to use a formula
$\\ ( {a + b + c)}^{2} = {a }^{2} + {b}^{2} + {c}^{2} + 2(ab + bc + ca)$
According to the rule,

Here a=42k ,b=36n and c=-42k

↘↘↘↘↘↘Answer↘↘↘↘↘↘↘

${(42k)}^{2} + {(36n)}^{2} + { (- 42k)}^{2} + 2(42k \times 36n + 36n \times ( - 42k \: ) + ( - 42k \: ) \times 42k) \\ \\ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = \\ = 1764 {k}^{2} + 1296 {n}^{2} + 1764 {k}^{2} + 2(1512kn + ( - 1512nk) - 1764 {k}^{2} \\ = 3528 {k}^{2} + 1296 {n}^{2} + 3024 kn - 3024nk - 3528 {k}^{2} \\ = 1296 {n}^{2} \: is \: the \: only \: answer$


Because positive and negative same values can be cancelled.

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