найти сумму корней уравнения. Created by volkaaa07. algebra-ru

найти сумму корней уравнения...

volkaaa07 @volkaaa07

July 2022 2 21 Report

найти сумму корней уравнения

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D=6^2-4*1*(-7)=36+28=64; x1=(-6-8)/2, x2=(-6+8)/2. x1= -7, x2=1. x1+x2= -7+1= -6. Ответ: x1+x2= -6.

0 votes Thanks 2

RepGodEminen008 ${x}^{2} + 6x - 7 = 0 \\ {x}^{2} + 7x - x - 7 = 0 \\ x(x + 7) - (x + 7) = 0 \\x (x + 7) \times (x - 1) = 0 \\ x + 7 = 0 \\ x - 1 = 0 \\$
x1 = -7
x2 = 1
x1+ x2 = -7 + 1 = -6

1 votes Thanks 2

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