Question

cine îmi rezolvă acest exercițiu primește coroană+abonat+10puncte​

Answer 1

a) 5x+10= 5(x+2)

b) 16x²-9= (4x+3)(4x-3)

c) x²-10x+25= (x-5)²

d) (3x+1)(x-2)-(3x+1)(x+2)=

=(3x+1)(3x+1)-(x-2)(x+2)

=9x²+1-x²-4

=x²(9+1-1-4)

=x²(9+1-3)

=x²(10-3)

=x²×7

=7x³

e)(x-y)²-16x²+8x-1=

=x²+y²-2xy-16x²+8x-1

=x(x+y²-2y-16x+8-1)

f) (x+3)²-(x-5)²=

=x²+9+6x-x²+25-10x

=x(x+9+6-x+25-10)

=x(x+14-x+25-10)

=x(x+39-x-10)

=x(x+29-x)

=29x