Question

Pls answer this as fast as possible

Answer 1

${(3)}^{15} \times {(3)}^{2p } = {(3)}^{21} \\ = {3}^{2p + 15} = {3}^{21} \\ = 2p + 15 = 21 \\ = 2p = 21 - 15 \\ = 2p = 6 \\ \\ = 6 \div 2 \\ p = 3$