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(3a-4)² = (3a+2)² + (a+4)²
9a²-24a+16 = 9a²+12a+4+a²+8a+16
a²-4a+4=0
faktorin deh, ketemu a = 2 :)
9a^+24a+16=9a^+12a+4+a^+8a+16
9a^+24a+16=10a^+20a+20
10a^-9a^+20a-24a+20-16=0
a^-4a+4=0
(a-2)^=0
a=2