Question

a) 8x^2 – 1 = ?
b) 16x^2 + 8x + 1 = ?
c) 25 – 16x^2 = ?

Dau coroana. repede.

Answer 1

$a)~8 x^{2} -1=(2 \sqrt{2} x+1)(2 \sqrt{2}x-1) . \\ b)~16 x^{2} +8x+1=(4x+1) ^{2} . \\ c)~25-16 x^{2} =(5+4x)(5-4x).$