3x (4x – 5) + 3 and find its values for (i) x = 3 (ii)x=1/2
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Answer:
i) 72
ii) 9/2 is the answer
Step-by-step explanation:
3x(4x-5) + 3
12x² - 15x + 9
put x = 3
12(3)² -15(3) + 9
= 12 x 9 - 45 +9
= 108 - 45 + 9
= 72
Now, put x = 1/2
12(1/2)² - 15(1/2) + 9
12/4 - 15/2 + 9
3 - 15/2 + 9
(6 - 15 + 18)/2
9/2
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