Question

Efectuați : a) (x+7)(x-7)
b)(√3x+√5)(√3x-√5)

Answer 1

a) (x+7) la a doua=xla a doua+2ori x ori7+7 la a doua =x la a doua+14 x + 49
b)
(radical din3 x+radical din5) la a doua= 3x +2radical din 10 x + 5

Answer 2

a) (x+7)(x-7)=x²-49

iar

b) (√3x+√5)(√3-√5)=$\sqrt{3x}^{2} - \sqrt{5} ^{2} = 3x-5$