How do you evaluate f(x)=2|-x+3|-9xf(x)=2|−x+3|−9x for x=-4?

1 Answer
Daniel L.
Mar 31, 2017

See explanation.

Explanation:

To calculate the value of an expression for a specified value of a variable you substitute the given value for all occurences of the variable and then simplify the expression:

f(x)=2xx|-x+3|-9xf(x)=2×|−x+3|−9x

So

f(-4)=2xx|-(-4)+3|-9*(-4)=2xx|4+3|-9*(-4)=f(−4)=2×|−(−4)+3|−9⋅(−4)=2×|4+3|−9⋅(−4)=
=2xx|7|+36=14+36=50=2×|7|+36=14+36=50

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