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x= [ -b +- √ b.b - 4ac ] ÷ 2a
20x.x + 8x -10 -20 = 0
20 x^2 + 8x - 30 = 0
a = 20 b = 8 c = -30
x= [ -8 +- √ (8)(8) - 4(20)(-30) ] ÷ 2(20)
x= [ -8 +- √ 2464 ] ÷ 40
x= (-8/40) +- (4√154 / 40)
x= (-8+4√154) / 40 ~ 1.04
o
x= (-8-4√154) / 40 ~ -1,44
entonces la mas grande es la positiva