Question

Efectuati utilizand formula: (a-b) la puterea 2=a la puterea 2-2ab+b la puterea 2
a) (x+3) (x-3)
b) (a-2) (a+2)
c) (b-4) (b+4)
d) (2x-3) (2x+3)
e) (2a+1) (2a-1)
f) (2a+3b) (2a-3b)
g) (4a-3b) (4a+3b)
h) (2x-5y) (2x+5y)
i) (6x+5) (6x-5)

Answer 1

formula utilizata aici este (a+b)(a-b)=a²-b²
a) (x+3) (x-3)=x²-9
b) (a-2) (a+2)=a²-4
c) (b-4) (b+4)=b²-16
d) (2x-3) (2x+3)=4x²-9
e) (2a+1) (2a-1)=4a²-1
f) (2a+3b) (2a-3b)=4a²-9b²
g) (4a-3b) (4a+3b)=16a²-9b²
h) (2x-5y) (2x+5y)=4x²-25y²
i) (6x+5) (6x-5) =36x²-25²

Answer 2

a) (x+3) (x-3)= x²-9
b) (a-2) (a+2)= a²-4
c) (b-4) (b+4)= b²-16
d) (2x-3) (2x+3)=4x²-9
e) (2a+1) (2a-1)= 4a²-1
f) (2a+3b) (2a-3b)=4a²-9b²
g) (4a-3b) (4a+3b)= 16a²-9b²
h) (2x-5y) (2x+5y)= 4x²-25y²
i) (6x+5) (6x-5) =36x²-25

Dupa (a+b)x(a-b)= a² -b²