Question

Va rog. Este foarte URGENT. Îmi trebuie azi.​

Answer 1

Răspuns:

e) x³+3x²=x(x+3)

f) 3x^4-5x²=x²(3x²-5)

g) x²-12x+36=(x-6)²

h) x²+14x+49=(x+7)²

i) x²-81=(x-9)(x+9)

j) 4x²-100=4(x-5)(x+5)=4(x²-25)

k) 2x²-8=2(x-2)(x+2)=2(x²+4)

l) x³-9x=x(x-3)(x+3)=x(x²-9)

m) x³+2x²+x=x(x+1)²=x(x(x+2)+1)=x(x²+2x+1)

n) ax-ay+bx-by=(a+b)(x-y)=ax-ay+b(x-y)=a(x-y)+b(x-y)

o) x²+3x+2=(x+2)(x+1)=x(x+3)+2

p) x²+9x+14=x(x+9)+14

3. a) (x-3)²=x²-6x+9

b) (3x+1)²=9x²+6x+1

c) (4x-7)(4x+7)=16x²-49

4. (x+2)²+2(2x-3)(2x+3)-(3x-2)²=

= (x²+4x+4)+(4x-6)(2x+3)-(9x²-12x+4)=

= (x²+4x+4)+(4x-6)(2x+3)-9x²+12x-4=

= 9x²-9x²+16x+4-4-18=

= 16x-18

COROANĂ?:)