Question

La punctul : b , c , d . va rog.

Answer 1

b) 4x^2-9y^2+9y^2= 4x^2
c)(x-2)^2
d)5/4 x^2-1/4 x^2=4/4x^2=x^2

Answer 2

b) (2x)^2 - (3y)^2 +9y^2=
4x^2 -9y^2 + 9y^2=
4x^2

c) x^2-4x+4=(x-2)^2

d)$( \frac{ \sqrt{5} }{2}x) ^{2} -( \frac{1}{2}x )^{2}= \frac{5}{4} x^{2} - \frac{1}{4} x^{2} = \frac{4}{4} x^{2} = x^{2}$