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Verified answer
Un = - 12 - (3n)U7 = - 12 - (3(7)
U7 = - 12 - 21
U7 = - 33
U8 = - 12 - (3(8))
U8 = - 12 - 24
U8 = - 36
U7 + U8
= - 33 + (- 36)
= -33 - 36
= -69 (A)
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Verified answer
Bismillah(-12 - (3 x 7)) + (-12 - (3 x 8)) =
(-12 - 21) + (-12 - 24) =
-33 + -36 =
-69 (pilihan A)
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