1 113zami Full Member 10+ Year Member 15+ Year Member Oct 26, 2007 #1 Advertisement - Members don't see this ad 15^x + 15^(x+1)=? ansr: 16(15^x) how did they get this ansr, in kaplan exponent rules, it says x^a+x^b= x^a+x^b so you can't add do anything to it if it's addition with the same base and different exponents, I don't understand how they got this ansr?
Advertisement - Members don't see this ad 15^x + 15^(x+1)=? ansr: 16(15^x) how did they get this ansr, in kaplan exponent rules, it says x^a+x^b= x^a+x^b so you can't add do anything to it if it's addition with the same base and different exponents, I don't understand how they got this ansr?
tastybeef Full Member 10+ Year Member 5+ Year Member 15+ Year Member Oct 26, 2007 #2 15^(x+1) = (15)(15^x) Therefore, 15^x + 15^(x+1) = 15^x + (15)(15^x) = (16)(15^x) Upvote 0 Downvote
1 113zami Full Member 10+ Year Member 15+ Year Member Oct 26, 2007 #3 thanks, i have to learn how to think backwords : ) Upvote 0 Downvote
