Question

Calculati :
A) (x-3)²
b) (2x+3)²
c) (4x-7)•(4x+7)

Answer 1

$(x-3) ^{2} = x^{2} -2*3x+9$
$(2x+3) ^{2} =4 x^{2} +2*2x*3+9$
(4x-7)*(4x+7)=16$x^{2}$-49
folosesti formulele $(a-b) ^{2} =a ^{2} -2ab+b ^{2}$ , $(a+b) ^{2} =a ^{2} +2ab+b ^{2}$
(a+b)(a-b)=$a^{2} - b^{2}$

Answer 2

a) x²-6x+9
b) 4x²+12x+9
c)16x²-49

Sper că te-am ajutat !