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b) (2x-5)² = 4x ^2 -20x +25
c) (3x-y)²= 9x^2 -6xy + y^2
d) (1/2x - 2)²= 0,25 x ^2 -2x +4
e) (2x-5)²= 4x^2 -20x +25
f) (7-5z)²= 49 -70z +25z ^2
g) (2x+3y)²= 4x ^2 + 12xy + 9 y ^2
h) (1/2x+2y)²=0,25 x ^2 + 2xy +4y^2
i) (5x+1)²= 25x ^2 +10x +1
j) (x-2y)(x+2y)=x ^2 +2xy -2xy -4x^2
k) (3x+4y)(3x-4y)= 9x^2 -12xy +12xy -16y ^2
b) (2x-5)²= 4x²-20x+25
c) (3x-y)²= 9x²-6xy+y²
d) (1/2x - 2)²= 0,25x²-2x+4
e) (2x-5)²= 4x²-20x+25
f) (7-5z)²= 49-70z+25z²
g) (2x+3y)²= 4x²+12xy+9y²
h) (1/2x+2y)²= 0,25x²+2xy+4y²
i) (5x+1)²= 25x²+10x+1
j) (x-2y)(x+2y)= x²+2xy-2xy-4y²
k) (3x+4y)(3x-4y)= 9x²-12xy+12xy-16y²
b)=√21x
c)9x²-y²
d)-3,75x²
e))√21x
f)-70z²
g)4x²+9y²
h3,75x²
i)24x²
j)x³-8y²
k)9x²-16y²