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VARVARA [1.3K]
2 years ago
12

If a = 5 and b=2 then find the value of - 2ab and - 3a+b

Mathematics
2 answers:
attashe74 [19]2 years ago
7 0

Answer:

  • -2ab = -20
  • -3a + b = -13

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:

<h2>PART I: Find the value of -2ab</h2>

<u>Given information</u>

a = 5

b = 2

<u>Given expression</u>

-2ab

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

-2 (5) (2)

<u>Simplify by multiplication</u>

=-10 (2)

=\boxed{-20}

--------------------------------------------------------

--------------------------------------------------------

<h2>PART II: Find the value of -3a + b</h2>

<u>Given information</u>

a = 5

b = 2

<u>Given expression</u>

-3a + b

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

-3 (5) + (2)

<u>SImplify by multiplication</u>

=-15 + (2)

<u>Simplify by addition</u>

=\boxed{-13}

Hope this helps!! :)

Please let me know if you have any questions

dusya [7]2 years ago
3 0
-2ab = -2(5)(2) = -20
-3a+b = -3(5)+2 = -13
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