9a^2 -4ab^2 -3a+7b
plz tell me correct answer
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\left[a _{1}\right] = \left[ \frac{1}{6}+\frac{ - \sqrt{\left( 9+144\,ab^{2} - 252\,b\right) }}{18}\right][a1]=[61+18−√(9+144ab2−252b)]
ritika2015:
what's this I can't understand it
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