Question

(4a+4b-2x)*(2a+2b+x) stiind ca x=5 si a+b+c =13

Answer 1

$(4a+4b-2x)(2a+2b+x)= \\ \\ =[4(a+b)-2 \cdot 5][2(a+b)+5]= \\ \\ =(4 \cdot 13-10)(2 \cdot 13+5)= \\ \\ =42 \cdot 31= \\ \\ =1302$

Answer 2

[4*(13)-2*5]*[2*(13)+5]= 42*31=1302