youssef13 youssef13

23-12-2017
Mathematics

contestada

if (x+y)^2 =49 and (x-y)^2 = 9 what is the value of x

Respuesta :

ElenaClaudia ElenaClaudia

23-12-2017

Hello from Romania!

[tex](x+y)^2 = 49 \\ x+y= \sqrt{49} \\ x+y=7 \\ \\ (x-y)^2=9 \\ x-y= \sqrt{9} \\ x-y=3 \ \ \ \ \Rightarrow y=x-3 \\ \\ x+y=7 \\ x+x-3=7 \\ 2x-3=7 \\ 2x=10 \\ \boxed{x=5}[/tex]

Good luck!

Answer Link

Otras preguntas

What led to the creation of magna carta, known as the cornerstone of modern english law?

1. A trapezoid has an area of 91 m2. The height of the trapezoid is 7 m and the measure of one base is twice the height. What is the measure of the other base o

Is burning a draft card protected by the first amenment?

Why does the Moon have different phases? A) the Sun moves around the Moon B) the Moon moves around the Sun C) the Moon moves around the Earth D) the Moon fol

How has Minnesota’s population changed since 1980?

rewrite as exponent log (9x)=5

Given that g(x)=x^2, find each of the following. a) g (1) b) g (-2) c) g(-x) d) g (2y) e) g(2+h)

How do I find this missing measurement?

2 + 15 ÷ 3 × 5 Simplify the numerical expressions, and classify each as a sum, difference, product, or quotient.

what kind of relationship exists between the birds and the cattle