m2x2 + (m2-n2)x - n2 = 0. solve by quadratic equation
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m²x²+ (m²-n²)x - n²= 0
=>m²x²+m²x-n²x-n²=0
=> m²x(x+1)-n²(x+1)=0
=> (x+1)(m²x-n²)=0
=>x+1=0 or m²x-n²=0
=> x= -1 or x = n²/m²
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