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misalkan titik baliknya (xe, ye)
maka:
xe = -b/2a
= -(p + 2)/2.10
= -(p + 2)/20
ye = - (b² - 4ac)/4a
= -((p+2)² - 4(10)(2))/4.10
= -(p²+4p +4 - 80)/40
= -(p² + 4p - 76)/40
xe = ye
-(p + 2)/20 = -(p² + 4p - 76)/40
2p + 4 = p² + 4p - 76
p² + 2p - 80 = 0
(p + 10)(p - 8)= 0
p = -10 atau p = 8