Ithink of a number, halve it, then subtract four

algebraic notation using x for unknown numbers

The algebraic representation of the situation is 4 - 1/2x

Let

x = unknown number

1/2 of x

= 1/2x

= 4 - 1/2x

Therefore, algebraic representation of the situation is 4 - 1/2x

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(x·)-4

If that's not what you're looking for here's an example of what you would do if you put a number (6, for example) into the equation and the answer is the unknown number:

(6·)-4= x

-14

step-by-step explanation:

2x2 – 2(x+4)

=2x2-2（5+4）

=4-2×9

=4-18

=-14

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb