The roots of a quadratic equation with rational coefficients

taiangh2022-10-04 11:39:541条回答

The roots of a quadratic equation with rational coefficients are p±√q.Write the equation in standard from in terms of p and
Adrien said that if the roof of a quadratic equation are 12 and 34 ,the equation is 4x^2 -5x +32 =0.Olivia said that the equation is 8x^2 -10x +3=0 .Who is correct?Justify your answer.

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寻紫陌共回答了16个问题 | 采纳率87.5%: x^2 -2px +p^2-q=0
都对但第二个方程漂亮些没有分数; 1年前

determine the equation of a quadratic function determine the equation of a quadratic function conditions:x-intercept 3,and passing through the point (1,-2) 吵了分了走了1年前3: 门牛10149 共回答了13个问题 | 采纳率92.3%

It sounds like that it passes thru 3 points:　(0,0),(3,0),(1,-2)
From the first 2 points,it can be expressed in the form of y = ax(x-3)
It passes thru (1 -2):-2 = a*1*(1-3)
a = 1
y = x(x-3)

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如果a和b是二次方程×（2×7根）1 = 0,形成一元二次方程的根的倒数neagtive（倒数）的在x和

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1.用二次定理证明对于这个方程式的平方根必须含有-a/b作为它们的和,a/c作为他们的乘积
2.证明这个方程的平方根的平方是a/b-2ac,（提示）：考虑（r1+r2）.从一个关于r1+r2的表达式得出

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about quadratic equation about quadratic equation Joan is 2 years younger than her brother Matthew,and 32 years younger than her father.Three years ago,the product of the ages of Joan and Matthew was exactly 2 times the age of their father.How old is Matthew now?PS:Ans is 13 55762491年前1: chenqy_79 共回答了22个问题 | 采纳率90.9%

J=JOAH M=MATTHEW F=FATHER
M=J+2 F=J+32
the product of 乘积的意思因为是三年前
即 (J-3)(M-3)=2(F-3)
带入前俩式子得(J-3)(J+2-3)=2(J+32-3)
解二元一次会吗然后就出来了 J=11或-5(舍因为年龄>0)
M=11+2=13

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Solution:
Let h be 50m
-4.9t²+38t+1.75=50
4.9t²-38t+48.25=0
t₁= 1.60s
t₂= 6.16s
Time duration Δt = 6.16-1.60 = 4.56 (s)
Ans:The length of time is 4.56 seconds.

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(楼上胡说)
用二次公式求下列函数的零点（即求根）
简化答案,但不要写成小数形式.
x= (- 80 ± √(80²-4*25*64))/(25*2)
= -8/5

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double Minimum=data[1],Answer=0.;
for(int i=2;i

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题目的意思是：如果一个简单二项式x+m和一个二次式（x-1）^2的乘积等于一个三次多项式x^3+ax+b,那么 a=?,b=?,m=?.
由题意知：（x+m）*(x-1)^2=x^3+ax+b
所以 x^3+(m-2)x^2+(1-2m)x+m=x^3+ax+b
由两边各项系数相等得：m-2=0,1-2m=a,m=b;
所以计算得：m=b=2,a=-3

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The roots of a quadratic equation with rational coefficients

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