When x = -, the algebraic expression 4x ^ 2 + 5x + 6 is equal to 3x ^ 2 + 2

When x = -, the algebraic expression 4x ^ 2 + 5x + 6 is equal to 3x ^ 2 + 2

X = - 1 or - 4

The number after the letter is the square number, just write the answer directly, and give more than 70% of the answers (of course, it's best to answer all of them)
8a3-b3
4(x-y+1)+y(y-2x)
3x2+5xy-2y2+x+9y-4
3x2+4xy-y2
x2+x-(a2-a)
a3+1
1. What is the mass of 2.7g al
2. The amount of a substance is 0.2mol, and its mass is?

1、8a^3-b^3=(2a)^3-b^3=(2a-b)(4a^2+2ab+b^2)
2. Original formula = 4x-4y + 4 + y ^ 2-2xy
=(4x-2xy)+(y^2-4y+4)
=2x(2-y)+(y-2)^2
=(y-2)(y-2-2x)
3. Original formula = (3x-y) (x + 2Y) + X + 9y-4
=(3x-y)(x+2y)-(3x-y)+4x+8y-4
=(3x-y)(x+2y-1)+4(x+2y-1)
=(3x-y+4)(x+2y-1)
4、3x²+4xy-y²
=4x²+4xy-y² -x²
=(2x-y)² --x²
=(3x-y)(x+y)
5、x²+x-(a²-a)
=(x²-a²)+x+a
=(x+a)(x-a)+(x+a)
=(x+a)(x-a+1)
Just distribute the formula
6、a^3+1=(a+1)(a^2-a+1)
a^3-1=(a-1)(a^2+a-1)
This is the formula, remember!
Chemistry: n = m / M