Ответы на вопрос:
1) x ²-10x+9 = 0 a =1; b = -10; c=9 d = b²-4ac d = (-10)²- 4 ·9 = 100 - 36 = 64(√64=8) x1 = -b+√d/2a ⇒ )+8/2 = 18/2 = 9. x2 = -b-√d/2a ⇒ ) -8/2 = 2/2 = 1. 2) 5x²+12x+4 = 0 a=5; b=12; c=4 d = b²-4ac d = 12² - 4·5·4 = 144 - 80 = 64 (√64=8) x1 = -b+√d/2a ⇒ -12+8/2·5 = -4/10 = -0,4. x2 = -b-√d/2a ⇒ -12-8/2·5 = -20/10 = -2.
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