4x²-9= (2x-3)(2x+3)
4a²+12ab+9b²= (2a+3b)²= (2a+3b)(2a+3b)
16a⁴-81= (4a²-9)(4a²+9)= (2a-3)(2a+3)(4a²+9)
36x²-12xy+y²= (6x-y)²= (6x-y)(6x-y)
(3x-1)²+(4x+2)²= (5x-1)(5x+1)
9x²-6x+1+16x²+16x+4-25x²+1=0
10x+6=0
5x+3=0
x= -0,6
4x²-9= (2x-3)(2x+3)
4a²+12ab+9b²= (2a+3b)²= (2a+3b)(2a+3b)
16a⁴-81= (4a²-9)(4a²+9)= (2a-3)(2a+3)(4a²+9)
36x²-12xy+y²= (6x-y)²= (6x-y)(6x-y)
(3x-1)²+(4x+2)²= (5x-1)(5x+1)
9x²-6x+1+16x²+16x+4-25x²+1=0
10x+6=0
5x+3=0
x= -0,6