Please could you explain this step by step I’m really stuck.

Mathematics

2 answers:

erastova [34]2 years ago

6 0

Answer:

x = -5/2, 2

Step-by-step explanation:

Given:

$\displaystyle \large{\dfrac{5}{x+3}+\dfrac{4}{x+2} = 2}$

With restriction that <u>x-values cannot be -3 and -2</u> else it will turn the expression as in undefined.

First, multiply both sides by (x+3)(x+2) to get rid of the denominator.

$\displaystyle \large{\dfrac{5}{x+3}\cdot (x+2)(x+3)+\dfrac{4}{x+2} \cdot (x+2)(x+3) = 2 \cdot (x+2)(x+3)}\\\\\displaystyle \large{5(x+2)+4(x+3) = 2(x+2)(x+3)}$

Simplify/Expand in:

$\displaystyle \large{5x+10+4x+12 = 2(x^2+5x+6)}\\\\\displaystyle \large{9x+22=2x^2+10x+12}$

Arrange the terms or expression in quadratic equation:

$\displaystyle \large{0=2x^2+10x+12-9x-22}\\\\\displaystyle \large{2x^2+x-10=0}$

Factor the expression:

$\displaystyle \large{(2x+5)(x-2)=0}$

Solve like linear equation as we get:

$\displaystyle \large{x=-\dfrac{5}{2}, 2}$

Since both x-values are not exact -2 or -3 - therefore, these values are valid. Hence, x = -5/2, 2

allochka39001 [22]2 years ago

3 0

Answer:

x = -2.5
x = 2

Step-by-step explanation:

Hello!

We can remove the denominators by multiplying everything by it.

Solve:

$\frac{5}{x + 3} + \frac4{x + 2} = 2$
$5 + \frac{4(x + 3)}{x + 2} = 2(x + 3)$
$5 + \frac{4x + 12}{x + 2} = 2x + 6$
$5(x + 2) +4x + 12 = (2x + 6)(x + 2)$
$5x + 10 + 4x + 12 = 2x^2 + 6x + 4x + 12$
$9x + 22 = 2x^2 + 10x + 12$

Let's make one side equal to 0.

$0 = 2x^2 + x - 10$

Solve by factoring, and then the zero product property.

$0 = 2x^2 + x - 10\\$

Multiply 2 and -10. You get -20. Think of two number that multiply to -20, and add to 1. If we think about the standard form of a quadratic, $ax^2 + bx + c$ , think two numbers that equal "ac" and add up to "b".