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(3a + 4)² = (a + 4)² + (3a + 2)²
<=> 9a² + 24a + 16 = a² + 8a + 16 + 9a² + 12a + 4
<=> 9a² + 24a + 16 = 10a² + 20a + 20
<=> 10a² - 9a² + 20a - 24a + 20 - 16 = 0
<=> a² - 4a + 4 = 0
Dengan menggunakan rumus abc, diperoleh:
a = {4 +- √(16 - 16)}/2
a = 4/2
a = 2
Jadi, a = 2