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Calculati:
a) [tex] x^{2} -144[/tex] =
b) [tex]16a^{2} -40ab+ 25 b^{2} [/tex] =
c) [tex] x^{2} +8x+16[/tex] =
d) [tex](2a+3) (2a-3) [/tex] =
e) [tex]7 x^{2} - y^{2} [/tex] =


Răspuns :

[tex]a)x^2-144=(x-12)(x+12)\\ b)16a^2-40ab+25b^2=(4a-5b)^2\\ c)x^2+8x+16=(x+4)^2\\ d)(2a+3)(2a-3)=4a^2-9\\ e)7x^2-y^2=(x\sqrt7+y)(x\sqrt7-y)[/tex]