add
(5+6x+3x^2+9x^3)(7-6x+3x^2-9x^3)
there is too many numbers and im lost to where to start

Question

saifoo.khan · Answer

is there a + sign in b/w?

anonymous · Answer

If you are adding them then you can write it as $$5 + 6x + 3x^2 + 9x^3 + 7 - 6x + 3x^2 - 9x^3$$ It looks complicated but all you do is group all the numbers with x^3 then group the x^2 then group the x and then group the constants like this $$(9x^3 - 9x^3) + (3x^2 + 3x^2) + (6x - 6x) + (5 + 7)$$

anonymous · Answer

simplify and you get $$0x^3 + 6x^2 + 0x + 12$$

anonymous · Answer

Which can be written as $$6x^2 + 12$$ or $$6(x^2 + 2)$$ both are right.