4X ^ 2-7x-3 - () = 2x ^ 2-3x + 8 find the truth in brackets --

4X ^ 2-7x-3 - () = 2x ^ 2-3x + 8 find the truth in brackets --

4x² - 7x - 3 -( ) = 2x² - 3x + 8
( ) = 4x² - 7x - 3 - 2x² + 3x - 8
( ) = 2x² - 4x - 11

Simplification: 3x2 - [7x - (4x-3) - 2x2]

3x2-[7x-（4x-3）-2x2]
=3x2-[7x-4x+3-2x2]
=3x2-7x+4x-3+2x2
=5x2-3x-3．

3x^2-[7x-(4x-3)-2x^2]=

3x2-[7x-(4x-3)-2x2]
=3x2-7x+(4x-3)+2x2
=3x2+2x2-7x+4x-3
=5x2-3x-3

3x^2-[7x-(-3+4x)-2x^2]=?

I answered this question just now!
First go to the innermost bracket, and then the outer bracket, layer by layer
When removing the bracket, if there is a negative sign outside the bracket, all items in the bracket change sign; if it is a positive sign, go directly
3x^2-[7x-(-3+4x)-2x^2]
＝3x^2-[7x+3-4x-2x^2]
=3x^2-7x-3+4x+2x^2
=5x^2-3x-3

Simplify 3x ^ 2 - [7x - (4x-3) - 2x ^ 2 Add one more question - 3 (1-1 / 6x)

3x^2-[7x-(4x-3)-2x^2]
=3x^2-[7x-4x+3-2x^2]
=3x^2-3x-3+2x^2
=5x^2-3x-3
-3(1-1/6x)=-3+1/2x

3x square one [7x-3 (4x-3) 2x square]

5 × square + 5 × - 9

The 2nd power of 3x - [7x - (4x-3) - 2x to the 2nd power]

3x²-【7x-（4x-3）-2x²】
=3x²-【3x+3-2x²】
=5x²-3x-3

The second power of 3x - {7x - (- 3 + 4x) - 2x}

The original formula = 3x? - [7x - (- 3 + 4x) - 2x?]
=3x²-(7x+3-4x-2x²)
=3x²-7x-3+4x+2x²
=(3x²+2x²)+(-7x+4x)-3
=5x²-3x-3

Try to explain that no matter what value algebra x takes (8-7x-6x's quadratic power + 2x's cubic power) + (X Cubic + 5x's cubic + 4x-1) - (- X's quadratic-3x)+ The value of the third power of 2x is independent of X

You must have input a few wrong places in this question. The following is the original question of guess. If there is something wrong, you can ask me directly
(8-7x-6x²+2x³）+（x³+5x²+4x-1)-(-x²-3x+3x³-3）
=8-7x-6x²+2x³+x³+5x²+4x-1+x²+3x-3x³+3
=10
That is, there is no X in this algebraic expression,
Regardless of the value of X, the value of the algebraic expression is independent of X

1. X quadratic-x + 5-2x + 0.5-3x quadratic 2.2x quadratic-3x-1 + (- 5) - 3x + X quadratic 3.3x quadratic-7x + 4x + 3 + 2x quadratic 4.2x quadratic + 0.5-3x-4x + 4x-2x-2 To merge similar items Sum of 1.2x quadratic - 3x + 1 and - 3 quadratic + 5x-7 2. - x quadratic + 3xy-0.5y and - 0.5x + 4xy-0.15y To calculate

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4.6xsquare-7x-1.5