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    Work: Find the solution of equation a2+4a+2 = 7 .
    Question type: Equation
    Solution:Original question:

a

×

2

+

4

a

+

2

=

7

Left side of the equation =

6

a

+

2

    The equation is transformed into :

6

a

+

2

=

7

    Transposition :

6

a

=

7

−

2

    Combine the items on the right of the equation:

6

a

=

5

    The coefficient of the unknown number is reduced to 1 :

a

=

5

÷

6

=

5

×

1 6

    We obtained :

a

=

5 6

    This is the solution of the equation.

    Convert the result to decimal form :

a

=

0.833333

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