josediaz100
josediaz100
26-08-2014
Mathematics
contestada
find zero of f(x)=x^2+2x-15
Respuesta :
l33t
l33t
26-08-2014
x ²+2x-15
factorize the equation
(x+5)(x-3)
therefore the zeros are -5 and 3
Answer Link
Аноним
Аноним
26-08-2014
[tex]f(x)=x^2+2x-15\\\\f(x)=0\iff x^2+2x-15=0\\\\x^2+5x-3x-15=0\\\\x(x+5)-3(x+5)=0\\\\(x+5)(x-3)=0\iff x+5=0\ or\ x-3=0\\\\\boxed{x=-5\ and\ x=3}\leftarrow zeros[/tex]
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