Question

2.
4. (a) Simplify 3x (4x - 5)+3 and find its values for (i) x = 3 (ii) x =1/4
(b) Simplify ala'+a+1) +5 and find its value for (i) a = 0, (ii) a = 1
(iii) a=-1.​

Answer 1

Answer:

i 66,ii -3/2

Explanation:

For x = 3, we have

12 × (3)2 – 15 × 3 + 3 = 12 × 9 – 45 + 3 = 108 – 42 = 66

x=1/2 in the equation we get

12x2 – 15x + 3 = 12 (1/2)2 – 15 (1/2) + 3

=12 (1/4) – 15/2 +3

= 3 – 15/2 + 3

= 6- 15/2

= (12- 15 ) /2

= -3/2

Answer 2

:

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3x(4x−5)+3=12x^2−15x+3

x=3 gives the value 12(9)−15×3+3

                             =108−45+3

                              =66

x=1/2 gives the value 12(1/4)−15×(1/2)+3

                             =3−7.5+3

                              = - 3/2