Solve the following quadratic equations:
a) m²+17mn-84n²
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Answer:
m^2+17mn-84n^2
⇒m^2-21mn+4mn-84n^2
⇒m(m-21n)+4n(m-21n)=0
⇒(m+4n)(m-21n)=0
⇒m+4n=0 and m-21n=0
m=-4n and m=21n
Step-by-step explanation:
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