Question

Q.18
A function fis defined by f(x)=2x-5.Write down the value of (1) f(0
Q.19
Let A= {1,2} and b ={3,4} .write AXB.
Q.20
Write the relation R= {(x,x) : x is a prime number less than 10 }in
SECTION B
2.21 Let f(x) = x2 and g(x) = 2x + 1 be two real functions. Find
(f+g) (x), (fg) (x)
2.22 Express the function f: AR. f(x) = x - 1. where A = {-4,0, 1, 4)
Pairs.
223
A wheel makes 360 revolutions in one minute. Through how
second?
224
Find the value of cos 570° sin 510° + sin (-330°) cos (-390°).
225
Write the following sets in the roaster form.​

Answer 1

Answer:

18) f(x)=2x-5

f(0)=2*0-5

=0-5

=-5

19) A={1,2}

B={3,4}

A*B={(1,3),(1,4),(2,3),(2,4)}

20) R={(x,x):x is a prime number less than 10}

={(2,2),(2,3),(2,5),(2,7),(3,5),(3,7),(5,7)}