Question

9 (2a-b)^2 -4(2a-b)-13​

Answer 1

Answer:72

Step-by-step explanation:

(3)(5^2-2*5)-2(9)

6(25-10)-18

 

6(15)-18

90-18=72

I get the same answer you do.

Bob

Answer 2

Step-by-step explanation:

let 2a-b=x

=> 9x²-4x-13

=> 9x²-13x+9x-13

=> x(9x-13)+1(9x-13)

=> (9x-13)(x+1)

now substitute x

=> (18a-9b-13)(2a-b+1)