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saw5 [17]
3 years ago
5

5x^2 - x + 9 when x = -5

Mathematics
2 answers:
kirza4 [7]3 years ago
6 0

Answer:

139

Step-by-step explanation:

If x=-5

then

5*-5^2-(-5)+9

5*25+5+9

139

valentina_108 [34]3 years ago
3 0

Answer: 139

Concept:

Here, we need to understand the idea of evaluation.  

When encountering questions that gave you an expression with variables, then stated: "If x = a, y = b, z = c" (a, b, c are all constants), this means you should substitute the value given for each variable back to the expression.

Solve:

<u>Given information</u>

5x² - x + 9

x = -5

<u>Substitute value into the expression</u>

=5(-5)² - (-5) + 9

<u>Simplify exponents</u>

=5 (25) + 5 + 9

<u>Simplify by multiplication</u>

=125 + 5 +9

<u>Simplify by addition</u>

=\boxed {139}

Hope this helps!! :)

Please let me know if you have any questions

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