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Need help asap with math question! Offering double points!

Need help asap with math question! Offering double points!-example-1
User Gesselle
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Q6. Given



y= ax^2 + bx + c


the vertex is in between the two zeros; it's



x=- (b)/(2a)


which we know from the quadratic formula is the midpoint between the zeros.


We get a negative x coordinate when a and b have the same signs. Let's go through the choices.



y = -3x^2 -7x + 4 -3 and -7 have the same sign, negative x, CHECK



y = -3x^3 + 7x - 4 different signs, nope



y = 3x^2 -7x + 4 different signs, nope



y = 3x^2 + 7x - 4 same sign, CHECK


1st and 4th choice.


Q7.


The correct first step of evaluating the polynomial at x=3/4 is to substitute 3/4 for x, first choice.




User Prasad Rajapaksha
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