Răspuns:
x²-17x+72=x²-8x-9x+72=x(x-8)-9(x-8)
=(x-8)(x-9)
x²-4x-21=x²+3x-7x-21=x(x+3)-7(x+3)
=(x+3)(x-7)
x²-7x-18=x²+2x-9x-18=x(x+2)-9(x+×)
=(x+2)(x-9)
(x-V3)²-48=x²-2V3+V3²-48
x²-2V3+3-48=x²-2V3-45
f) (4x+3)²-24x-18=4x²+2×4x×3+3²-24x-18
16x²+24x+9-24x-18=16x²-9=(4x+3)(4x-3)
g)(2x+3)²-10x-15=2x²+2×2x×3+3²-10x-15
4x²+12x+9-10x-15=4x²+2x-6
h)4x³+4x²-x-1=4x²(x+1)-(x+1)
(x+1)(4x²-1)=(x+1)(2x-1)(2x+1)
i)9x³+9x²-4x-4=9x²(x-1)-4(x-1l
(x-1)(3x+1)(3x-1)
2
9x²-4y²=(3x-2y)(3x+2y)
20=(3x-1)×5>>>3x-1=4
n=4+16+64+256=340
Explicație pas cu pas:
sper sa te ajute, la mine este 2 dim când fac asta :)) sper sa ma antelegi..
