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(2x-3)^2-13=36

(la prima e o formula de calcul prescuetat!)


Răspuns :

(2x-3)²-13=36
⇒(2x-3)²=49
⇒2x-3∈{7,-7};
⇒2x-3=7⇒2x=10⇒x=5;
⇒2x-3=-7⇒2x=-4⇒x=-2;
⇒x={5,-2};
(2x-3)²-13=36
4x²-12x+9-13=36
4x²-12x=36-9+13
4x²-12x=40
4x(x-3)=40
4x=40=>x=10
x-3=40=>x=37