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OpenStudy (anonymous):
find the zeros of the function algebraically. (Show work please) f(x)= 2x^2-7x-30
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OpenStudy (anonymous):
What you could do here is simple factor
OpenStudy (anonymous):
find two numbers that multiply to give -60 and add to give -7
OpenStudy (anonymous):
-12 and 5 are these numbers (after guess and check)
OpenStudy (anonymous):
2x^2 -12x+5x-30 = 2x(x-6)+5(x-6) = (x-6)(2x+5)
OpenStudy (anonymous):
so x= 6, x=-2.5
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