Simplify: and find values for 3x(4x-5) +3 and find values for (i) x=3 (ii) x=1/2.

3x(4x-5) +3= 3x X 4x X 3x X 5+3 = 12x²-15x+3
(i) for x=3, 12x²+15x+3=12(3)²-15×3+3
= 12×9–45+3=108–45+3=66
(ii) for x=1/2, 12x² -15x+3=12(1/2)²-15×1/2+3=12×1/4-15/2+3
= 6-15/2=12-15/2=-3/2

Class 8 Maths Chapter 9 Exercise 9.3 Solution in Video

for more answers vist to:
https://www.tiwariacademy.com/ncert-solutions/class-8/maths/chapter-9/