Question

(3-2a)la puterea2 -(4a+1)la puterea2 +(4a-5)(4a+5)

Answer 1

Răspuns:

Explicație pas cu pas:

(3-2a)²-(4a+1)²+(4a-5)(4a+5)=

9-12a+4a²-16a²-8a-1+16a²-25=

4a²-20a-17

Answer 2

(3-2a)²-(4a+1)²+(4a-5)(4a+5)=?

(a-b)²=a²-2ab+b²  ,       (3-2a)²=9-12a+4a²

(a+b)²=a²+2ab+b²  ,      (4a+1)²=16a²+8a+1

(a-b)(a+b)=a²-b²  ,        (4a-5)4a+5)=16a²-25

9-12a+4a²-16a²-8a-1+ 16a²-25= 4a²-20a-17