Question

Vă rog rapid,dau coroană:) 7 si 8.​

Answer 1

Răspuns:

$7) \\ a) \\ (x {}^{2} - 5 {}^{2}) \times( x {}^{2} - 5 {}^{2} )$

$(x {}^{2} - 25) \times( x {}^{2} - 25)$

$x {}^{4} - 25x {}^{2} - 25x {}^{2} + 625$

$x {}^{4} - 50x {}^{2} + 625$

$b)$

$(x {}^{2} - 16)(x {}^{2} - 16 )$

$x {}^{4} - 16x {}^{2} - 16x {}^{2} + 256$

$x {}^{4} - 32x {}^{2} + 256$

$c)$

$(2x {}^{2} - 1)(2x {}^{2} - 1)$

$4x {}^{4} - 4x {}^{2} + 1$

$d)$

$(3x {}^{2} - 4)(3x {}^{2} - 4)$

$9x {}^{4} - 24x {}^{2} + 16$

$8) \\ a) \\ 5x {}^{2} + 20x + 24$

$b) \\ 10x {}^{2} - 24x - 16$

$c) \\ 7x {}^{2} + 20x - 5$

$d) \\ - 5x {}^{2} + 36x + 13$