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如何解一元四次方程x^4+2x^3+9x=0

用单变量求解,无实解

x=roots([3 4 7 2 9 12]) 或 x=double(solve('3*x^5+4*x^4+7*x^3+2*x^2+9*x+12')) 结果: x = -0.9583 0.6737 + 1.0159i -0.8612 - 1.4377i -0.8612 + 1.4377i 0.6737 - 1.0159i

是想求x等于多少还是怎么的?每个方程是一个题目么?

(1)x ² + 2 x - 8 = 0 x ² + 2 x + 1 = 8 + 1 (x + 1)² = 9 x + 1 = ± 3 x = ± 3 - 1 x1 = 3 - 1 = 2 x2 = - 3 - 1 = - 4 (2)x ² - 4 = 2 x x ² - 2 x - 4 = 0 x ² - 2 x + 1 = 4 + 1 (x - 1)² = 5 ...

196x²-1=0 (14x+1)(14x-1)=0 x1=-1/14 x2=-1/14 4x²+12x+9=81 (2x+3)²=9² 2x+3=±9 2x=-3±9 x1=3 x2=-6 3x²-1=2x+5 3x²-2x-6=0 b²-4ac=4+72=76 x=[2±根号76]/6=[1±根号19]/3

您好: x方+6x=1 x方+6x+9=1+9 (x+3)方=10 x+3=±√10 x=-3±√10 x方-14x=8 x方-14x+49=8+49 (x-7)方=57 x-7=±√57 x=7±√57 x方+2x+2=8x+4 x方-6x=2 x²-6x+9=2+9 (x-3)方=11 x-3=±√11 x=3±√11 如果本题有什么不明白可以追问,如果满意请点击“采...

(1)x^2-9x+8=0 答案:x1=8 x2=1  (2)x^2+6x-27=0 答案:x1=3 x2=-9  (3)x^2-2x-80=0 答案:x1=-8 x2=10  (4)x^2+10x-200=0 答案:x1=-20 x2=10  (5)x^2-20x+96=0 答案:x1=12 x2=8  (6)x^2+23x+76=0 答案:x1=-19 x2=-...

=6+25/(1)X^2-6X+4=0X2-2X-1/=2+49/16(t-7/-6X+9-5=0(X-3)24=-1/X23+1(X-1)2+5X=6 =5X-3=±√5X1=3+√5X2=3-√5(2)X^2+5X-6=0 X22(4)3X^2-1=6X 2+(7/+5X+(5/=4/-7t/-2X+1=1/2+7/4)2-7t/2=1X2=-5/=49/4X+5/3=0X24-9/2X1=-5/4)2X22)22-2=0t22=±7/3X2=1...

解:关于x的方程2x²-(2m+1)x+m=0中,a=2 , b=-(2m+1) , c=m △=b²-4ac =[-(2m+1)]²-4×2×m =4m²+4m+1-8m =4m²-4m+1 =(2m-1)² 由题意,可得 (2m-1)²=9 2m-1=±3 2m-1=3 或 2m-1=-3 m=2 或 m=-1 当m=2时,a=2,b=...

(3-x)(4-x)=48-20x+2x² (x-3)(x-4)=48-20x+2x² x²-7x+12=48-20x+2x² x²-7x+12-48+20x-2x²=0 -x²+13x-36=0 x²-13x+36=0 (x-4)(x-9)=0 x-4=0或x-9=0 所以x1=4或x2=9。

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