Question

x²+ (X+2)²=130 find x
​

Answer 1

Answer:

x =7

Step-by-step explanation:

x^2 + ( x + 2 )^2 = 130

x^2 + ( x^2 + 4 + 4x) = 130

x^2 + x^2 + 4 + 4x = 130

2x^2 +4x =130-4

2x^2 + 4x = 126

put the value of x = 7

2*7*7 + 4*7= 126

Answer 2

Answer:

${x}^{2} - {(x + 2)}^{2} = 130 \\ \\ = > {x}^{2} - ( {x}^{2} + 2x + 4) = 130 \\ \\ = > {x}^{2} - {x}^{2} - 2x - 4 = 130 \\ \\ = > - 2x - 4 = 130 \\ \\ = > - 2x = 130 + 4 \\ \\ = > - 2x = 134 \\ \\ = > x = \frac{134}{ - 2} \\ \\ = > x = - 67$

formula used :

( a+b )^2 = a^2 + 2ab + b^2

hope it helps uH :)