Question

3. Use the expression to answer the question.

(7x2 4x + 5) (3x2 6x + 2)

Which is equal to this expression?
(Points : 3)
4x^2 - 10x + 7

4x2 + 2x + 3

4x^2 - 2x + 3

21x^2 - 10x + 7

Answer 1

the problem : (7x^2 - 4x + 5) - (3x^2 - 6x + 2)

7x^2 -3x^2 - 4x - 6x + 5+ 2

4x^2 - 10x + 7 is the answer?

Answer 2

-(3x^2-6x+2) is equal to -3x^2 + 6x -2.

Answer 3

So it's: 7x^2 - 3x^2 -4x + 6x +5 -2.

Answer 4

So the answer would be 4x^2 + 2x + 3

Answer 5

wait why is it + 6x if it was -6x to begin

Answer 6

Because the negative sign outside shifts the symbol of everything inside the parenthesis.

Answer 7

-(-6x) = +6x.

Answer 8

i thought it was set up like this:

(7x^2 - 4x + 5) - (3x^2 - 6x + 2)

(7x^2 - 3x^2) ((+)(5)) ((-)(4x)) (-) (6x) (+) (2)

Answer 9

then:

(4x^2) (-)(6x) (-) (4x) (+)(5) (+)(2)

Answer 10

so now: (4x^2) - (10x) + (7)

Answer 11

i used the () to group the symbols with the numbers and variables so that when i carry them to switch i would have the same sign...