Solve 2x - 5 = 7
Need explanation and working out for x?

Move all terms not containing x to the right side of the equation.

Add 5 to both sides of the equation.

2x=7+5

Add 7 and 5.

2x=12

Divide each term by 2 and simplify.

2x/2=12/2

Divide x by 1.

x=12/2 => x=6

Step-by-step explanation:

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.

3

step-by-step explanation:

divide 13.5 by 9 to get the scale factor. it equals 1.5

2 * 1.5 = 3