Subtract : 9a – 6b from -8a + 9b
a – 3b
a + 3b
17a – 15b
-17a + 15b
(-8a + 9b ) – ( 9a – 6b) = - 8a + 9b - 9a + 6b
= - 8a - 9a + 9b +6b
= - 17a + 15b
The quantities 8a, 15a, 17a from a Pythagorean triplet.
What should be subtracted from 12a – 16b to obtain -a – b?