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# I shouldn't be wrong!

It should be -2. Why did they sum the 20? 20 is a constant, not a coefficient, right? And also, the solution has one more error also.. Look at the part when the $$x^2$$ is multiplied with the function inside the bracket besides it.

Edit: I know that after 20 there is a variable of x which has power of 0. But, isn't it still a constant?

Note by Eka Kurniawan
2 years, 11 months ago

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I know that after 20 there is a variable of x which has power of 0. But, isn't it still a constant?

Yes, it is a constant. And it is the co-efficient of $$x^0$$. · 2 years, 11 months ago

The coefficient of the constant term $$20 x^0$$ is 20.

Thanks for pointing out the typo in the solution. I've edited it. It should say -3 instead of -5 throughout, and in the second solution $$31$$ should be replaced by $$3 \times 1$$. The final answer of 18 is still correct. Staff · 2 years, 11 months ago

thanks for the correction. I have one more prob, where should I report? by note or? · 2 years, 11 months ago

You can click on the "Request Clarification or Dispute" link placed at the bottom.

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I noticed that after you view solutions, the link is not available. I'd get the link to be displayed. In the meantime, you can send me an email with the screenshot, and I'd check it out. Thanks! Staff · 2 years, 11 months ago

what's your e-mail? · 2 years, 11 months ago

Calvin @ brilliant.org

(no spaces) Staff · 2 years, 11 months ago