помогите решить это квадратное уравнение срочно нужно завтра. Created by rew9. algebra-ru

помогите решить это квадратное уравнение срочно нужно завтра...

Dимасuk

Verified answer

7х² + 8х + 1 = 0
D = 64 - 28 = 36
x1 = (-8 + 6)/14 = -2/14= -1/7
x2 = (-8 - 6)/14 = -14/14 = -1
Ответ: х = -1/7; 1.

1 votes Thanks 2

NastenkaLogvinovka

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7x^{2}+8x+1=0
a=7 b=8 c=1
D=b^{2}-4ac=8^{2}-4*7*1=64-28=36
x_{1} = -b+\sqrt{D} / 2a = -8+6/2*7= 2/14= \frac{1}{7}
x_{2} = -b-\sqrt{D} / 2a = -8-6/2*7= -14/14= -1

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