Question

aiudaaa por favooooor :(((​

Answer 1

Explicación paso a paso:

9.    C) (x+2)(x-2)

$x^{2} -4\\(x+2)(x-2)$

10.    D) X1 = 0  X2 = 3

$2x^{2} =6x\\2x^{2} -6x+0=0\\2x................0\\x..............-3$

$X_{1} =0$     y    $x-3=0\\X_{2} =3$

11.     B) Teresa x = 6

$x^{2} -2x=24\\x^{2} -2x-24=0\\x.............-6\\x.................4$

$X_{1} +4=0$  y   $X_{2}-6=0$

$X_{1}= -4$   y   $X_{2}=6$

12.     D) b = 10 y h = 5

$altura = a\\ base=2a$

$(2a)(a)=50\\2a^{2} =50\\a^{2} =25\\a=\sqrt{25}\\a=5$

$Reemplazamos:$

$altura = a=5\\ base=2a=2(5)=10$