1) a^8 * a^15 : a^21 = a^2
a^23 : a^21 = a^2
a^2=a^2
2) x^18 * x^10=x^28
x^28=x^28
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Answers & Comments
1) a^8 * a^15 : a^21 = a^2
a^23 : a^21 = a^2
a^2=a^2
2) x^18 * x^10=x^28
x^28=x^28