Simplify this expression.

3x^2(7x^2 - 9)

Question

Simplify this expression.

3x^2(7x^2 - 9)

anonymous · Answer

$$3x ^{2}(7x^{2} - 9)$$

anonymous · Answer

yess

anonymous · Answer

You have to work with $$7x^2 - 9$$ cause $$3x^2 $$ is already simple.
You can think of $$7x^2-9$$ as a quadratic equation. Thene, you have to know that it can be written in a factoriced form. You has to solve for x the equation $$7x^2 - 9 = 0 $$
See that  this is equal to  $$x^2 = 9/7 $$ and  x = $$x = \pm \sqrt{(9/7)}$$ And that is equal to $$x = \pm 3/\sqrt{7}$$

anonymous · Answer

Excuse me, do you know how to solve quadratics?

anonymous · Answer

D.  But then you are not SIMPLIFING, you are just multipling....applying the distributibe propertie of the product.