Question

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

Answer 1

Answer:

(i) X=3

3X(4X-5)+3 = 3(3)(4*3-5)+3=9(7)+3=66.

(ii) X=1/2

3X(4X-5)+3 = 3(1/2)(4(1/2)-5)+3=(3/2)(-3)+3=(-9/2)+3= -3/2.

(i) a=0

a(a+a+1)+5=0.

(ii) a=1

a(a+a+1)+5=1(1+1+1)+5=8.

(iii) a=-1

a(a+a+1)+5=-1(-1-1+1)+5=6.

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