Question

Dau coroniță! !!!
5),6)

Answer 1

a) x^2 - y^2 = (x-y)(x+y)
b) x^2 - 9 = (x-3)(x+3)
c) 4 - a^2 = (2-a)(2+a)
d) 9y^2 - 16z^2 = (3y-4z)(3y+4z)
e) 25x^2 - 9y^2 = (5x=3y)(5x+3y)
f) a^2b^2 - 49 = (ab-7)(ab+7)

a) x^4 - x^2 = (x^2-x)(x^2+x)
b) 9x^4 - 25 = (3x^2-5)(3x^2+5)
c) 1/4 - a^2 = (1/2-a)(1/2+a)
d) y^2 - 16z^2/25 = (y-4z/5)(y+4z/5)
e) x^2/9 - 9y^2/49 = (x/3-3y/7)(x/3+3y/7)
f) 1/81a^2b^2c^2 - 4 = (1/9abc-2)(1/9abc+2)

Primele formule de calculc care se fac la clasa a7-a:)

Answer 2

5. a. x^2-y^2=(x-y)(x+y)
b. x^2-9=(x-3)(x+3)
c. 4-a^2=(2-a)(2+a)
d. 9y^2-16z^2=(3y-4z)+(3y+4z)
e. 25x^2-9y^2=(5x-3y)(5x+3y)
f. a^2b^2-49=(ab-7)(ab+7)
6. a. x^4-a^2=(x^2-a)(x^2+a)
b. 9x^4-25=(3x^2-5)(3x^2+5)
c. 1/4-a^2=(1/2-a)(1/2+a)
d. y^2-16/25z^2=(y-4/5z)(y+4/5z)
e. x^2/9-9y^2/49=(x/3-3y/7)(x/3+3y/7)
f. 1/81a^2b^2c^2-4=(1/9abc-2)(1/9abc+2)