Question

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

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Answer 1

Step-by-step explanation:

opening bracket first we get

12x^2-15x+3

putting x=3 we get

12(3)^2-15(3)=12*9-45

=108-45

=63

putting 1/2 as x we get

12(1/2)^2-15(1/2)

=12*1/4-15/2

=3-15/2

6-15/2

-9/2

Answer 2

Answer:

Given eqn. 12x²-15x+3=0

Simplified eqn.=4x²-5x+1=0

1). x=3. 2).x=1/2

4(3)²-5(3)+1=0. 4(1/2)²-5(1/2)+1=0

36-15+1=0. 1-5/2+1=0

22. 2-5+2=0

-1

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