f(x)=-x^2-3x+1=-(x+3/2)^2+13/4
å¼å£åä¸ï¼å¯¹ç§°è½´æ¯X=-3/2
æ
å¨ï¼-æ ç©·ï¼-3/2ï¼ä¸æ¯åè°å¢å½æ°ï¼å¨ï¼-3/2ï¼+æ ç©·ï¼ä¸æ¯åè°åå½æ°ã
f(x)=2x^2-4x-5=2(x-1)^2-7
å¼å£åä¸ï¼å¯¹ç§°è½´æ¯x=1
æ
å¨ï¼-æ ç©·ï¼1ï¼ä¸æ¯åè°åå½æ°ï¼å¨ï¼1ï¼+æ ç©·ï¼ä¸æ¯åè°å¢å½æ°ã
追é®æè¿ä¸¤éé¢å½æ°çå¾ååï¼
追çå¾åå¾ç®ååï¼ä½ æä¸å 个ç¹å°±è¡äº
追é®ææ³è¦å¾