Question

Dau coroana!
Efectuati, folosind formule de calcul:
a) (3x - 2y)(3x + 2y) + (3x + 3y + 1)²
b) (√3x + 2)² + (2√3x - 1)² - (3√3x - √2)
c) (x + 2)² + (x - 3)² - (x + 1)(x - 1)- calculati cu formula de calcul prescurtat
d) 4(x√3 + 1)² - √3(8x- √3) - (x√21 - √2)(x√21 + √2)- formula de calcul prescurtata
e) (4√2x - √30)(4√2x + √30) - 3(x√21 + √2)- formula de calcul prescurtat

Answer 1

a)9x²-4y²+9x²+9y²+18xy+6x+6y+1=18x²+5y²+18xy+6x+6y+1
b)3x²+4√3x+4+12x²-4√3x+1-3√3x+√2=15x²+5-3√3x+√2
c)x²+4x+4+x²-6x+9-x²+1=x²-2x+14
d)4(3x²+2√3x+1)-8√3x+3-21x²+2=12x²+8√3x+4-8√3x-21x²+5=-9x²+9=9(1-x²)=9(1-x)(1+x)
e)32x²-30-3√21x-3√2