Ineed to know how to find the real roots/zeros. i know you have to set the numerator to zero but it is possible to get a real root from x squared?

The probability of drawing a heart from a standard deck of cards is .25. you record the card you draw and return the card before shuffling to ensure a binomial distribution. if you do this 20 times what is the probability that you will draw a heart 7 times? a. 0.888 b. 0.001 c. 0.112 d. 0.473