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OpenStudy (anonymous):
evaluate the polynomial for x=-7. 2x^2-3x+9
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OpenStudy (anonymous):
Just plug in -7 as x!
OpenStudy (zehanz):
So you have to calculate: 2*(-7)²-3*-7+9. What have you got?
OpenStudy (anonymous):
i got -110
OpenStudy (anonymous):
I got 128
OpenStudy (anonymous):
just done by head dont trust me
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OpenStudy (zehanz):
2*(-7)²=2*49=98 -3*-7=21 So 98+21+9=128
OpenStudy (mertsj):
\[2(-7)^2-3(-7)+9=2(49)+21+9=98+21+9=128\]
OpenStudy (anonymous):
thank you!
OpenStudy (anonymous):
Always remember WHATEVER squared is always positive
OpenStudy (anonymous):
also - · - = +
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OpenStudy (mertsj):
yw
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