Question

E(x)=(x+1)²+(x+3)²-(7+x²)​

Answer 1

Răspuns:

${x}^{2} - 6x - 39$

Explicație pas cu pas:

$E(x) = {(x + 1)}^{2} + {(x + 3)}^{2} - {(7 + x}^{2} )$

$E(x) = {x}^{2} + 2x + 1 + {x}^{2} + 6x + 9 - (49 + 14x + {x}^{2} )$

$E(x) = {x}^{2} + 2x + 1 + {x}^{2} + 6x + 9 - 49 - 14x - {x}^{2}$

$E(x) = - 6x - 39 + {x}^{2}$

$E(x) = {x}^{2} - 6x - 39$