find 'a' in each of the following.(a) 3power a×3power4=3power7
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a=3............................
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3^a × 3^4 = 3^7
3^a+4 =3^7
here, exponent is same
then power is equal
a+4=7
a=7-4
a=3
3^a+4 =3^7
here, exponent is same
then power is equal
a+4=7
a=7-4
a=3
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