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<span>Log√2 (x+5)(4-x)>log√2(5-3x)
4x+5=9-2x
6x=4
x=0,6</span>
( 1 + 3x) / x² = 10
10x² = 1 + 3x
10x² - 3x - 1 = 0
D = b² - 4ac = 9 - 4 × 10 × (-1) = 9 + 40 = 49 = 7²
x1 = ( 3 + 7) / 20 = 0,5
x2 = ( 3 - 7) / 20 = - 4/20 = - 0,2