单选题
If m2=17, then what is the value of (m+1)(m-1)?
【正确答案】
C
【答案解析】(m+1)(m-1)=m2-1=17-1=16.
**Since m2 = 17, m is slightly more than 4, and (m+1)( m-1) is the product of a number a little greater than 5 and a number a little greater than 3. The only reasonable choice is 16.
**Since m2 = 17, m is slightly more than 4, and (m+1)( m-1) is the product of a number a little greater than 5 and a number a little greater than 3. The only reasonable choice is 16.