sloamitlopez
sloamitlopez
26-04-2017
Mathematics
contestada
identify the roots f(x)=3x^2-27
Respuesta :
apologiabiology
apologiabiology
26-04-2017
factour ouf 3
f(x)=3(x²-9)
recognize diference of 2 perfect squres
a²-b²=(a+b)(a-b)
x²-9=x²-3²=(x+3)(x-3)
so
f(x)=3(x+3)(x-3)
seto to zero to find roots
0=3(x+3)(x-3)
0=x+3
-3=x
0=x-3
3=x
roots at x=-3 and 3
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