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x²+x = 812
x²+x-812 = 0
(x+29) (x-28) = 0
x = -29 atau x = 28 (ambil yg positif)
pola ke-m = pola ke-28
pola segitiga ke-28 = 0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28 = 406
jawabannya a. 406
semoga benar