Question

4. (a) Simplify 3x (4x - 5) + 3 and find its values for (i)x=3 (ii)x=
1
2
(b) Simplify a (a² + a +1) + 5 and find its value for (ila=n (jila=1​

Answer 1

Step-by-step explanation:

4.a)i)3x(4x−5)+3

Evaluate for x=3

(3)(3)((4)(3)−5)+3

=66

ii) 3x(4x−5)+3

Evaluate for x=12

(3)(12)((4)(12)−5)+3

=1551

b) your question is incorrect

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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