Răspuns:
13. a) (√3+√5x)²-(√15x-2)²=3+2√15x+5x²-15x²+4√15x-4=-10x²+6√15x-1
b) (3-√14x)²-(√7x+√2)²=9-6√14x+14x²-7x²-2√14x-2=7x²-8√14x-7
c) (2√2x-√3)²+(√2+2√3x)²=8x²-4√6x+3+2+4√6x+3x²=11x²+5
d) nu se vede complet
14. a) (x-5)(x+5)(x²+25)=(x²-25)(x²+25)=x⁴-625
b) (x-4)(x+4)(x²+16)=(x²-16)(x²+16)=x⁴-256
c) (2x-1)(2x+1)(4x²+1)=(4x²-1)(4x²+1)=16x⁴-1
d) (3x+2)(2-3x)(4+9x²)=(4-9x²)(4+9x²)=16-81x⁴
Explicație pas cu pas:
