Factor x^2+12x-13 i need help

(x+13)(x-1)

Step-by-step explanation:

When factoring x^2+12x-13, you want to think of 2 numbers that add up to 12, using scalar multiples of 13 (so think 13*1=13). We know that 13*1 is the only way to multiply 2 numbers evenly to get to 13, so now, find a combo of 13 and 1 to get 12. This is +13 and -1, so now put them into (x+13)(x-1).

the answer is 5/3x+7/5y+7

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)