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Page We find that the following diagram Relationship is a function ? abcabc abcabc abcabc abcabc Answer Yes

Page We find that the following diagram Relationship is a function ? abCdabCd abCdabCd abCdabCd abCdabCd No Yes

4.Relationship given in tabular form.Relationship is a function ? AB abcdeabcde AB abadcabadc Page 125 Yes No

4.Relationship given in tabular form.Relationship is a function ? AB abcdeabcde AB aaadcaaadc Page 125 Yes No

5Do the ordered pairs represent a function? Page 125 writing the domain and range, do not repeat values. 1. {(2,10), (3,15), (4, 20)} Yes, no x-coordinate is repeated.

5.Do the ordered pairs represent a function? Page 125 writing the domain and range, do not repeat values. 2. {(-7,3), (-2,1), (-2, 4),(0,7)} No, - 2 is repeated in the domain.

5.Do the ordered pairs represent a function? Page 125 writing the domain and range, do not repeat values Yes, no x-coordinate is repeated. 3. {(-2,1), (0,1), (2,1),(4,1),(-3,1)}

5.Do the ordered pairs represent a function? Page 125 writing the domain and range, do not repeat values {(5,0), (3,-1), (0,0),(5,-1),(3,-2)} No, 3,5 is repeated in the domain.

Function Notation When we know that a relation is a function, the “y” in the equation can be replaced with f(x). f(x) is simply a notation to designate a function. It is pronounced ‘f’ of ‘x’. The ‘f’ names the function, the ‘x’ tells the variable that is being used.

Value of a Function Since the equation y = x - 2 represents a function, we can also write it as f(x) = x - 2. Find f(4): f(4) = f(4) = 2 Find f(3): f(3) = f(3) = 1

Value of a Function If g(s) = 2s + 3, find g(-2). g(-2) = 2(-2) + 3 = = -1 g(-2) = -1

Value of a Function If h(x) = x 2 find h(2). h(2) = (2) 2 = 4 If h(x) = x 2 find h(5). h(5) = (5) 2 = 25

Value of a Function If h(x) = x 2 find h(-2). h(-2) = (-2) 2 = 4 If h(x) = x 2 find h(-5). h(-5) = (-5) 2 = 25

Value of a Function If h(x) = x 2 find h(-7). h(-7) = (-7) 2 = 49 If h(x) = x 2 find h(1). h(1) = (1) 2 = 1 Doman is {-2-1,0,1,2} : find ordered pairs of relations {(-2,4), (-1,1), (0,0),(1,1),(2,4)}

If f(x) = x Doman is {-5,-1,0,1,5} : find ordered pairs of relations {(-5,20), (-1,- 4), (0,-5),(1,- 4),(5,20)}

Doman is {-3,-2,-1,0,1,2,3} : find ordered pairs of relations {(-3,3), (-2,2), (-1,1), (0,0), (1,1)(2,2),(3,3)}

ASSIGNMENTS Page กำหนดให้ A = {a, b, c } และ B = {1,2 } จงเขียนแผนภาพ แสดงฟังก์ชันที่มีโดเมนเป็นเซต A และ เรนจ์เป็นเซต B มา 1 แผนภาพ 7. กำหนดให้ A และ B เป็นเซตที่มีสมาชิก 3 ตัว จงยกตัวอย่างแผนภาพแสดงฟังก์ชันที่มีโดเมนเป็น เซต A และ เรนจ์เป็นเซต B มา 1 ตัวอย่าง

ASSIGNMENTS 8.Doman is {-2,-1,0,1,2} : writing the ordered pairs of relations Page 125

ASSIGNMENTS 9.For the Daigram : find f(a), f(b), f (c) and f(d) abCdabCd abCdabCd abCdabCd abCdabCd Page 125

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