precalc
posted by Amanda on .
how do you solve this:
the square root of a+4 plus the square root of a3 equals 7

sqrt (a+4) + sqrt (a3)=7
with seven on the right, the sqrt have to add to integers, which means each is an integer.
So a has to be an integer, and a+4 and a3 is an integer with a ingeter square root.
Possible a:
Start with 1, and see if a4 and a3 have integer square roots. It wont take you more than 20 seconds to find it.