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二星初級會員
2010-11-1 17:02#1
if -4 and 2 are the roots of the quadratic equation -2x^2+rx+s=0
find the values of r and s -
一星新手會員
2010-11-1 17:21#2
if -4 and 2 are the roots of the quadratic equation -2x^2+rx+s=0
find the values of r and s
put -4 into -2x^2+rx+s
-2(16)-4r+s=0
4r+32=s......1
put 2 into -2x^2+rx+s
-2(4)+2r+s=0
2r+s=8......2
2r+(4r+32)=8
6r=-24
r=-4
s=16