How to simplify (2a + 3b) (3a + b) - 3AB

How to simplify (2a + 3b) (3a + b) - 3AB

Expand the brackets to get 6A & sup2; + 11ab + 3B & sup2; - 3AB = 6A & sup2; + 8ab + 3B & sup2;

2A ^ 3 + 3A ^ 2-1 = 0

2A? + 3A? - 1 = 2A? + 2A? + a? - 1 = 2A? (a + 1) + (a + 1) (A-1) = (a + 1) (2a? + A-1) = (a + 1) (a + 1) (2a-1) = 0, so a + 1 = 0 or 2a-1 = 0 leads to a = - 1 or a = 1 / 2
Thank you!

(3a+1)(2a-3)-6(a-1)(a+2)

(3a+1)(2a-3)-6(a-1)(a+2)
=6a^2-7a-3-6(a^2+a-2)
=6a^2-7a-3-6a^2-6a+12
=-13a+9

If 3A ^ 2-2a-3 = 0, then a ^ 2 + 1 / A ^ 2 =?

A:
3a^2-2a-3=0
Obviously, a is not equal to 0
3a-2-3/a=0
a-1/a=2/3
The square of both sides is as follows:
a^2-2+1/a^2=4/9
a^2+1/a^2=22/9

The following formula can be used to calculate ① (2a-3b) (3b-2a) ② (2a-3b) (3a + 2b) ③ (a + B + C) (a-b-c)
④（a+b-c）（c-b-a）

Option 3

A (A-1) + 2A (a + 1) - 3A (2a-5), where a = 2

a(a-1)+2a(a+1)-3a(2a-5)
=a^2-a+2a^2+2a-6a^2+15a
=-3a^2+16a
=-3x4+16x2
=-12+32
=20

(3a ^ 2-AB + 7) - 2 (- 2A ^ 2 + AB + 3.5) simplification

＝3a^2－ab＋7＋2a^2－2ab－7
＝5a^2－3ab

Simplification: - (2a ^ 2 + 5) + (3a ^ 2-2) - 2 (3a ^ 2-1)

-(2a^2+5)+(3a^2-2)-2(3a^2-1)
=-2a^2-5+3a^2-2-6a^2+2
=-5a^2-5

-(- 3A ^ 2 + 2a-1) - A ^ 2 reduction
Hint: A ^ 2 = A & # 178; = the power of A

2a²-2a+1

(A-3) (a + 7) - (3a + 7) (2a-1) simplification

(a-3)(a+7)-(3a+7)(2a-1)
=a^+4a-21-6a^-11a+7
= -5a^-7a-14