Question

(2a-b)(2a+b)
(5x+y)(y-5x)
(6a+5b)(6a-5b)
(X-3y)la a doua

Answer 1

Răspuns:

Explicație pas cu pas:

(2a-b)(2a+b)  = $(2a)^{2} - b^{2}$ = $4a^{2} - b^{2}$

(5x+y)(y-5x)  = (y+5x)(y-5x)  = $y^{2} - (5x)^{2} = y^{2} - 25x^{2}$

(6a+5b)(6a-5b)  = $(6a)^{2} - (5b)^{2} = 36a^{2} - 25b^{2}$

$(x-3y)^{2} = x^{2} - 6xy + (3y)^{2} = x^{2} - 6xy + 9y^{2}$