Question

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

Answer 1

folosim formula binomului (a+b)^2

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

Answer 2

$\green{ \huge \bf{formula:}}$

$\green{ \bf(a + b) {}^{2} = a {}^{2} + 2ab + {b}^{2} }$

$(x + 7) {}^{2} = x {}^{2} + 2 \times x \times 7 + 7 {}^{2} = \\ = x {}^{2} + 14x + 49$