1.

Find the value of following if x = 2.(i) – 3(ii) 2x – 5(iii) 9 – 6x(iv) 3x2 – 4x – 7(v) 5x/2 – 4

Answer»

(i) In x – 3 put x = 2

x – 3 = 2 – 3 = -1

(ii) In 2x – 5 put x = 2

2x – 5 = 2 x 2 – 5
= 4 – 5 = -1

(iii) In 9 – 6x put x = 2

9 – 6x = 9 – 6 x 2
= 9 – 12 = -3

(iv) In 3x2 – 4x – 7 put x = 2

3x2 – 4x – 7 = 3 x 2 x 2 – 4 x 2 – 7
= 12 – 8 – 7
= 12 – 15 = -3

(v) In 5x/2 – 4 put x = 2

5x/2 – 4 = (5 x 2)/2 – 4

= 5 – 4 = 1


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