一道SAT2数学题答好了我加分 if f(x)=x³-4x²-3x+2 which of the following are true?1.the function f is increasing for x≥32.the equation f(x)=o has two nonreal solutions3.f(x)≥-16 for all x≥0答案是1和3,为什么2不对?1,3
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![一道SAT2数学题答好了我加分 if f(x)=x³-4x²-3x+2 which of the following are true?1.the function f is increasing for x≥32.the equation f(x)=o has two nonreal solutions3.f(x)≥-16 for all x≥0答案是1和3,为什么2不对?1,3](/uploads/image/z/10055043-27-3.jpg?t=%E4%B8%80%E9%81%93SAT2%E6%95%B0%E5%AD%A6%E9%A2%98%E7%AD%94%E5%A5%BD%E4%BA%86%E6%88%91%E5%8A%A0%E5%88%86+if+f%28x%29%3Dx%26%23179%3B-4x%26%23178%3B-3x%2B2+which+of+the+following+are+true%3F1.the+function+f+is+increasing+for+x%E2%89%A532.the+equation+f%28x%29%3Do+has+two+nonreal+solutions3.f%28x%29%E2%89%A5-16+for+all+x%E2%89%A50%E7%AD%94%E6%A1%88%E6%98%AF1%E5%92%8C3%2C%E4%B8%BA%E4%BB%80%E4%B9%882%E4%B8%8D%E5%AF%B9%3F1%2C3)
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