C-05-Q044mediumsingle_mcq

Why does the equation in question 43 reduce to setting only the numerator to zero?

adenominators are equal
bnumerators of two sides are equal but denominators are unequal
cboth sides are zero
dit is an identity

ব্যাখ্যা

After rearranging, each side becomes a fraction whose numerators are identical while the denominators differ. A difference of such fractions can equal zero only when that common numerator is zero, so the problem reduces to setting the numerator equal to zero.

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