Find the value of m for which 9^m * 9 ^5 = 9^7.
we have
9^m * 9^-5 = 9^7.
As we know in multiplication when bases are same powers are added
9^m+(-5)=9^7
9^m-5 = = 9^7
when bases are equal powers are also equal
m-5 = 7
m=7+5
m=12
Hence we find the value of m=12
we find the value of m=12,by which LHS is equal to RHs.
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