Question

e(x)=
$(x \sqrt{2} + 1) ^{2} - (x \sqrt{2} + 1)(x \sqrt{2} - 1)$
VA ROOG!!

Answer 1

⇒ E(x) = $(2x^{2} + 2x \sqrt{2} +1) - (2x^{2} - 1) = 2x^{2} + 2x \sqrt{2} + 1 - 2x^2 + 1 = 4x^{2} + 2x\sqrt{2} + 2 = 2x(2x + \sqrt{2}) + 1$