Question

Please someone help me with this equation, I've been stuck on it for a while now.

This is Subtracting polynomials.

Subtract -4x^6+(-9x^2)+2x+(-8) from -8x^3+5x^2+3

Answer 1

in subtracting polynomials, you'll have to subtract like terms.
let's let
P1 = -8x^3+5x^2+3
P2 = -4x^6+(-9x^2)+2x+(-8)

you're question is P1 - P2 correct?

Answer 2

Yes.

Answer 3

I've done the equation around 6 times already and it keeps on telling me it's wrong.

Answer 4

always use parenthesis while subtraction.....
(-8x^3 + 5x^2 + 3) - [-4x^6 + (-9x^2)+ 2x + (-8)]
remember when there is a + sign outside the parenthesis open the parenthesis by keeping the sign of all the terms same as inside the parenthesis and whenever there is a - sign outside the parenthesis just change the sign of all the terms inside the parenthesis....

Answer 5

try it now....

Answer 6

since there is no x^6 term in P1, you can think of it as 0x^6. So when we subtract P1 - P2 you'll have to take
0x^6 - (-4x^6)
can you simplify this?

Answer 7

also....you can subtract like terms...

Answer 8

Ii also tried with the parenthesis...

Answer 9

actually, savvy's method is better..

Answer 10

see in continuity of my reply on parenthesis....
since before the first brackett there is no sign we keep signs of all the terms as it is, so it is:
-8x^3 + 5x^2 + 3
and since there is a - sign outside the 2nd brackett we change all signs...
4x^6 - (-9x^2)- 2x - (-8)
now also there are - signs outside some more bracketts so changing sins again would make it
4x^6 + 9x^2 - 2x + 8
now the expression becomes
-8x^3 + 5x^2 + 3 + 4x^6 + 9x^2 - 2x + 8
now joining like terms
which are only the constant terms and terms with x^2....
we get
4x^6 - 8x^3 + 13x^2 - 2x + 11

Answer 11

It still says that the answer is wrong...

Answer 12

the problem is

\[-8x^3 +5x^2 + 3-(-4x^6 -9x^2+2x -8) = -8x^3 + 5x^2 + 3 + 4x^6 + 9x^2 -2x + 8 \]

which gives

\[4x^6 - 8x^3 + 14x^2 -2x +11\]

Answer 13

oh yaah....i went wrong with that addition in the terms wid x^2.....lol..

Answer 14

@__@ It's okay! Thanks everyone! Everyone deserves a medal!

Answer 15

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