Question

Quick question. Does 9sqrt(x) * 4x+1 not equal 36x+9sqrt(x)?

Answer 1

Hello all.

Answer 2

Any ideas?

Answer 3

If you mean the following equation:
\[9 \times \sqrt{x} \times 4x + 1 = 36x + 9 \times \sqrt{x}\]
Then for very specific values of x, yes, but not in general.

Answer 4

Then...what did I do wrong?

Answer 5

Taking the left side of the equation:
\[9 \times \sqrt{x} \times 4x + 1 = 36x \times \sqrt{x} + 1\]
This is clearly not equal to the right. What did you start with?

Answer 6

I mean...I started with the expression I mentioned in my question.

Answer 7

I think you changed a multiply into an add and forgot you'd already multiplied by 9, so:
\[36x \times \sqrt{x}\]
Became:
\[36x + 9 \times \sqrt{x}\]