Question

FORMULA DE CALCUL PRESCURTAT : 3X+X TOTUL LA A 2 -A = ........

Answer 1

(3X+X)²=(4X)²=16X²
sau cu formula (a+b)²=a²+2ab+b²
(3X+X)²=9X²+6X²+X²=16X²

Answer 2

$(3x+x)^2=(4x)^2=4^2\cdot x^2=16x^2$
Sau
$(3x+x)^2=(3x)^2+2\cdot3x\cdot x+x^2= \\ \\ 3^2\cdot x^2+6x^2+x^2=9x^2+6x^2+x^2=16x^2$