SOLUTION: y=3(x+5)(x-2) Which of the following formulas is equivalent to the this one? a. y=3x^2+9x-30 b. y=x^2+3x-10 c. y=3x^2+3x-10 d. y=3x^2+3x-30

SOLUTION: y=3(x+5)(x-2) Which of the following formulas is equivalent to the this one? a. y=3x^2+9x-30 b. y=x^2+3x-10 c. y=3x^2+3x-10 d. y=3x^2+3x-30

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Question 73412: y=3(x+5)(x-2)
Which of the following formulas is equivalent to the this one?
a. y=3x^2+9x-30
b. y=x^2+3x-10
c. y=3x^2+3x-10
d. y=3x^2+3x-30
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
if you FOIL the last 2 factors (x+5)(x-2) you get

Now distribute a 3 to every term

So the right choice is a)
You can always let x and y be any numbers to verify this, or you can graph these and they should be equal.
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