面对什么我流泪了作文:If a and b are the roots of x^2+8x-5=0
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find the values of a^3+b^3 and a^3b^3. write the equation whose roots are a^3 and b^3
(ab)^3 how can get -3375? please discribe cleary, thanks!
(ab)^3 how can get -3375? please discribe cleary, thanks!
根据韦达定理:
x^2+8x-5=0的两根a,b满足
a+b=-8 ab=-5
a^3+b^3=(a+b)(a^2+b^2-ab)=(a+b)[(a+b)^2-3ab]=-632
a^3b^3=(ab)^3=-3375
所求方程为:x^2+632x-3375=0
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