Question

x√2 + 3 - ( x + 2√2) la a doua = 4 - x × ( x + 5√8) =?

Answer 1

x√2+3-(x+2√2)^2=4-x×(x+5√8)=
√2x+3-(x^2+4√2x+8)=4-x×(x+10√2)=
√2x+3-x^2-4√2x-8=4-x^2-10√2=
√2x+3-4√2x-8=4-10√2x=
-3√2x-5=4-10√2x=
-3√2x+10√2x=4+5
7√2x=9=9/7√2
x=9√2/14