The sum of a square of a number and one less than the number equals nine less than the square of one more than the same number.. A). Write the mathematical expression, and B). Solve the unknown number.​

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Step-by-step explanation:

★Question★

The sum of a square of a number and one less than the number, equals nine less than, the square of one more than the same number. Find the number.

★Answer★

Let the number be 'x'.

Atq,

=> x² +x-1=(x+1)²-9

=>x²+x-1=x²+1+2x-9

=>x²-x²+x-2x-1-1+9=0.

=>x-7=0

.°. x =7.

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540

10 b/c 5*2 =10

step-by-step explanation: