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What should be added 4a²-a²to get b²-4a²

only to add or substract should also be there
subtract should be there but in ques u asked only to add


What should be added 4a²-a² to get b²-4a²
4a²-a²) +x = (b²-4a²)
      x = (b²-4a²) - (4a²-a²)
        =   b²-4a² - 3a²
       =   b² -7a²
0 0 0
if u satisfied with this answer mark it has brainliest
If only to add then add 
-7 a^{2} + b^{2}

solution of above
4a²-a²) +R = (b²-4a²)
the value to be added
      x = (b²-4a²) - (4a²-a²)
        =   b²-4a² - 3a²
       =   b² -7a²
0 0 0
mark it has brainliestplz i need it
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