The function f(x)=-(x+5)(x+1) is shown. What is the range of the function ?
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Helping Hand
(-x-5)×(x+1)
-x(x+1)-5(x+1)
-x2-x -5x-5=0
take - as a common
x2+6x+5=0
x2+5x+1x+5=0
x(x+5)+1(x+5)=0
(x+1)=0
x=-1
x+5=0
x=-5
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