Question

Find the values of the following expressions for x = 2.
(i) 2x + 4
(ii) 4x - 3
(iii) 19 - 5x^2​

Answer 1

Answer:

(i) 8                        (ii) 5                    (iii) -1

Step-by-step explanation:

(i) 2x + 4                (ii) 4x - 3               (iii) 19 - 5x²

   x = 2                        x = 2                   x = 2

  2(2) + 4 = 8             4(2) - 3 = 5            19 - 20 = -1

Answer 2

Answer:

1)8

2)5

3)21

Step-by-step explanation:

1)2x+4

=2×2+4

=4+4=8

2)4x-3

=4×2-3

=8-3=5

3)19-5x^2

=19-20×2

=19-40

=21