Question

(x²+ 5) (x² - 9 )
Help D: ​

Answer 1

ΗΘΙΑ

$procedimiento :$

$\boxed{(x^{2} + 5) (x^{2} - 9 )}$

$\boxed{=(x^{2} +5)(x^{2} +-5)}$

$\boxed{=(x^{2} )(x^{2} )+(x^{2} )(-9)+(5)(x^{2} )+(5)(-9)}$

$\boxed{=x^{4}-9x^{2} +5x^{2} -45 }$

$\boxed{ \boxed{ \boxed{ \boxed{x^{4} -4x^{2} -45} } } }$

salu2!!