7^2 - 3*7
49 - 21
28
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(3/7+3)x7
10
(3 root 7) squared = (3 root 7) (3 root 7) = (3x 3) ( sq root 7 x 7) = 9 x sq root 49 = 9 x 7 = 63
When x = 7, f(x) = 3*(4-x) = 3*(-3) = -9
In mathematics, the symbol "x" typically represents multiplication. Therefore, "x7" means multiplying a number by 7. For example, if you have the expression 5 x 7, it would equal 35.