Question

ayuda con estos ejercicios pleasee :(

Answer 1

2X² + 10X + 12 = 0 donde a= 2; b = 10 c = 12

$X=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

$X=\frac{-10\pm \sqrt{10^2-4(2)(12)}}{2(2)}$

$X=\frac{-10\pm \sqrt{4}}{4}$

$X=\frac{-10\pm \ 2}{4}$

X1= [-10 + 2]/4 = -2

X2 = [-10 - 2]/4 = -3

2)
X² - 10X + 21 = 0 Donde a = 1; b = -10;  c = 21

$X=\frac{-(-10)\pm \sqrt{(-10)^2-4(1)(21)}}{2(1)}$

$X=\frac{10\pm \sqrt{100-84}}{2}$

$X=\frac{10\pm \sqrt{16}}{2}$

$X=\frac{10\pm \ 4}{2}$

X1 = [10 + 4]/2 = 7

X2 = [10 - 4]/2 = 3

Raices son X = 7 y X = 2

3.)  X² + 7X = 0;  Donde a = 1;  b = 7 c = 0

 $X=\frac{-7\pm \sqrt{7^2-4(1)(0)}}{2(1)}$

$X=\frac{-7\pm \sqrt{49}}{2}$

$X=\frac{-7\pm \ 7}{2}$

X1 = [-7 + 7]/2 = 0

X2 = [-7 - 7]/2 = -7

Raices X = 0 y X = -7