Question

Aplicatii ale formulelor de calcul prescurtat

Answer 1

(7x + 5)(7x - 5)
= (7x)^2 - 5^2
= 49x^2 - 25

(3x + 2)^2
= (3x)^2 + 2 * 3x * 2 + 2^2
= 9x^2 + 12x + 4

(3x + 4)^2
= (3x)^2 + 2 * 3x * 4 + 4^2
= 9x^2 + 24x + 16

(2v3 - v5)(2v3 + v5)
= (2v3)^2 - (v5)^2
= 2^2v3^2 - v5^2
= 12 - 5
= 7

(3v2 - 2v3)(3v2 + 2v3)
= (3v2)^2 - (2v3)^2
= 3^2v2^2 - 2^2v3^2
= 18 - 12
= 6

* = ori
^2 = la puterea a doua
v = radical