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(x+7)². cum se rezolva ?
va rog dau coroana ​


Răspuns :

folosim formula binomului (a+b)^2

(x+7)^2= x^2 + 14x + 49

[tex] \green{ \huge \bf{formula:}}[/tex]

[tex] \green{ \bf(a + b) {}^{2} = a {}^{2} + 2ab + {b}^{2} }[/tex]

[tex](x + 7) {}^{2} = x {}^{2} + 2 \times x \times 7 + 7 {}^{2} = \\ = x {}^{2} + 14x + 49[/tex]