Hitunglah nilai a, jika(a²+8²)-15=193,maka a =…

(a² + 8²) - 15 = 193
(a² + 8²) = 193 + 15
(a² + 8²) = 208
a² + 64 = 208
a² = 208 - 64
a² = 144
a = √144
a = 12

(a² + 8²) - 15 = 193
(a² + 64) - 15 = 193
a² + 49 = 193
a² = 193 - 49
a² = 144
a² - 144 = 0
a² - 12² = 0
(a + 12)(a - 12) = 0
a = 12
a = -12