Question

am nevoie de expresia asta va rog urgent ​

Answer 1

Răspuns:

Explicație pas cu pas:

1.

E(x)=(2-x)(2+x)+(x+3)²-2(2x+1)+1=4-x²+x²+6x+9-4x-2+1=2x+12

E(x)=2x+12

E(a)=-2

E(a)=2a+12=-2  ⇔2a+12=-2  ⇔2a=-14  ⇔a=-7

2.

E(x)=(x+5)²-(x+4)(x-4)-3(2x+5)=x²+10x+25-(x²-16)-6x-15=

x²+10x+25-x²+16-6x-15=4x+26  

E(x)=4x+26

E(a)=-6

E(a)=4a+26=-6    ⇔4a+26=-6  ⇔4a=-32  ⇔a=-8