Question

please answer to my question.

Answer 1

(2)

Let,

$p(x) = x { }^{2} - 5x + 5$

$p(0) = 0 {}^{2} - 5 \times 0 + 5$
= 0-0+5

=5

(3)n(A)=15

n(A U B) = 29

n(A n B)=7

That means,

29-15+7
=21



21 is the answer