Question

calculati. (√2x-1)(√2x+1)-(7x-3)²=

Answer 1

√2-1)(√2+1)=(√2)^2-1^2=2-1=1
(7X-3)^2=49X^2-42X+9
⇒1-49x^2+42x-9=-49x^2+42x-8

Answer 2

$( \sqrt{2} x-1)( \sqrt{2}x+1)-(7x-3)$$=\ \textgreater \ 2 x^{2} -1-(49 x^{2} -42x+9)=\ \textgreater \ 2 x^{2} -1-49 x^{2} +42x-9$$=\ \textgreater \ -47 x^{2} -10+42x$
$Succes$