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OpenStudy (anonymous):
In the equation y = 2x2 - 7x - 9, which of the following is a value of x when y = 0? A. 2 1/4 B. -9 C. 4 1/2 D. 3
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OpenStudy (anonymous):
find the roots of the equation when y=0
OpenStudy (anonymous):
2x2-7x-9=0 2x2+2x-9x-9=0 2x(x+1)-9(x+1)=0 (2x-9)(x+1)=0 x=9/2 or -1 hence answer C
OpenStudy (anonymous):
thx
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