Question

Simplify 7x2(3x – 9) + 3 and find its values for x = 4

Answer 1

Step-by-step explanation:

3x(4x−5)+3=12x

2

−15x+3

x=3 gives the value 12(9)−15×3+3

=108−45+3

=66

Answer 2

ANSWER

7x^2 (3x – 9) + 3

Solve for 7x^2 (3x – 9)

= (7x^2× 3x) – (7x^2× 9) (using distributive law: a(b – c) = ab – ac)

= 21x^3– 63x^2

So, 7x^2 (3x – 9) + 3

= 21x^3– 63x^2+ 3

Now, for x = 4,