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log (x² + 7x + 20) = log 10
x² + 7x + 20 = 10
x² + 7x + 20 - 10 = 0
x² + 7x + 10 = 0
x1 + x2 = -b/a = -7
x1 . x2 = c/a = 10
(x1 + x2)² - 4x1.x2
(-7)² - 4(10) = 49 - 40 = 9