Question

find out the value of the following expressions if x = 2:
(ii) 9- 4x
(iii) 5x2 - 3x + 8​

Answer 1

x = 2

(ii) 9 - 4x

= 9 - 4x2

= 9 - 8

= 1

(iii) 5x² - 3x + 8

= 5 × (2)² - 3×2 + 8

= 5×4 - 6 + 8

= 20 - 6 + 8

= 28 - 6

= 22

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Answer 2

I) 1

ii) 12

Step-by-step explanation:

I) 9-(4×2)

9-8

1

ii) 5x2-3x+8

5(2)^2-3(2)+8

20-6+8

20+2

22