TheDragonMaster

\bump

Please attach the diagram.

We can move all the terms to the left and simplify. We get:

$a + 10b = 24$

So, $a = 24 - 10b$

It says the answer is incorrect

Ok, thanks

Using Vieta, the roots sum to -7.

The probability of Grok first drawing a even blue card is $\frac{3}{7} \cdot \frac{1}{4} = \frac{3}{28}$. The probability of Grok drawing an even red card is $\frac{4}{7} \cdot \frac{1}{4} = \frac{4}{28} = \frac{1}{7}$. However, he took a card already, so the probability is actually $\frac{4}{27}$. So, the probability is $\frac 3 {28} \cdot \frac 4 {27} = \frac 1{63}$

It isn't correct.