Answer:
您能再解釋一下嗎,謝謝
Step-by-step explanation:
(3x + 2x -2) + (4x - 2x + 8) = 7x + 6
(2x + 5) + ( 7x - 10) + (3x - 4) + (4x -6) = 16x - 15
(4 + 2x3) + (5x3 + 2) = 27
(6x2 + 3x - 8) + ( 2x2 - 5x - 9) = 8x2 - 2x - 17
(4x2 - 9x3 + 2x4) + (8x4 - 3) + (5x3 - 7x2) = 19
(3 - 4x3 +6x4) + (2x4 + 5) + (9x3 - 8x2) = 39
(9x + 7y4) + (5x + 3x2 - 7y4) = 3x2 + 14x
<span>(9x2 - 5y - 12) + (8 - 9x2 + 5y + 4) = 0</span>
Answer:


Step-by-step explanation:
, 
Replace all occurrences of
in
with 


Add
and 3.


Subtract 5x from both sides of the <u>equation.</u>


Subtract 5x from 3x.


Rewrite 1 as
.


Check that the middle <u>term</u> is two times the <u>product</u> of the numbers being squared in the first <u>term</u> and third <u>term</u>.
·
· 

Rewrite the <u>polynomial</u>.
·
·


Factor using the <u>perfect square</u>
<u>trinomial</u> rule 
where a = x and b = 1.


<u>Set</u> the
equal to 0.


Add 1 to both sides of the <u>equation</u>.


Replace all occurrences of
in
with 1.


