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3 years ago

Solve (4x - 5) (x + 3) = 0. Please need help

Mathematics

1 answer:

MakcuM [25]3 years ago

5 0

Answer:

x= 5,-3

Step-by-step explanation:

(4x - 5) (x + 3) = 0.

$4 {x}^{2} + 3x - 5x - 15 = 0 \\ 4{x}^{2} - 2x - 15 = 0$

$the \: roots \: are \:$

5 and -3

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Despejar la variable <br> 2x al cuadrado + 15= 113

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Hola!

x = 7 , x = -7

Explicación:

Comienza restando 15 en cada lado:

$2x^{2} + 15 -15=113-15$

Usted obtiene:

$2x^{2} =98$

Ahora divide ambos lados por 2:

$\frac{2x^{2} }{2} =\frac{98}{2}$

Usted obtiene:

$x^{2} =49$

Como la ecuación está al cuadrado, tendrás que hacer:

$x=\sqrt{f(a)} , x=-\sqrt{f(a)}$

que te da: $x=\sqrt{49} , x =-\sqrt{49}$

Entonces:

$\sqrt{49}=7 , -\sqrt{49} = -7$

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