Answer :
Answer:
7
Step-by-step explanation:
let the no be 2x square as it is double
2xsquare -7 = 91
2xsquare = 91+7
2xsquare = 98
x square = 98 /2
x square = 49
x = 7
Answer:
x=±7
Step-by-step explanation:
let the no be x
ATQ,
[tex]2x { }^{2} - 7 = 91[/tex]
[tex]2x { }^{2} = 91 + 7[/tex]
[tex]2x { }^{2} = 98[/tex]
[tex]x {}^{2} = 98 \div 2[/tex]
[tex]x {}^{2} = 49[/tex]
[tex]x = \sqrt{49} [/tex]
x=±7