Question

EXERCISE 2.2
1. Find the value of the polynomial x2 - 7x + 12
at :
(1)x= 1 (2)x=-2 (3)x= 3 (4) x = 4
(5) x = 3

Answer 1

Step-by-step explanation:

The given polynomial is x² - 7x + 12

1. x = 1 then , put the value of x in the given polynomial

therefore ,

(1)² - 7(1) + 12 = 1 - 7 + 12 = 13 - 7 = 6

2. x = -2

therefore ,

( -2 )² - 7( -2 ) + 12 = 4 + 14 + 12 = 30

3. x = 3

therefore,

(3)² - 7(3) + 12 = 9 -21+12 = 21 - 21 = 0

4. x = 4

therefore,

(4)² - 7(4) + 12 = 16 - 28 + 12 = 28 - 28 = 0

5. x = 3

therefore,

(3)² - 7(3) + 12 = 9 -21+12 = 21 - 21 = 0

Answer 2

Step-by-step explanation:

p(x)=x^2-7x+12

p(1)=1^2-7×1+12

=1-7+12

=6

p(-2)=-2^2-7×-2+12

=4+14+12

=30

p(3)=3^2-7×3+12

=9-21+12

=0

p(4)=4^2-7×4+12

=16-21+12

=7

p(5)=5^2-7×5+12

=25-35+12

=2

^ sign refers to to the power

Hope this helps you

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