Question

Factorise it
m² + 17mn - 84n²
​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Step-by-step explanation:

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$\bf \huge \underline {Question }$

Factorise it

m² + 17mn - 84n²

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$\bf \huge \underline {solution }$

$\sf \to \: m^2+17mn-84n^2$

$\sf \to \:m^2+21mn-4mn-84n^2$

$\sf \to \:m(m+21n)-4n(m+21n)$

$\sf \to \:(m-4n)(m+21n)$

$\sf \blue{(m-4n)(m+21n)}$