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2 years ago

2x2 + 2x - 1 when x = -3

Mathematics

2 answers:

myrzilka [38]2 years ago

4 0

2x2+2x-1=
4+2(-3)-1=
4+(-6)-1=
4+(-7)=
-3

Elina [12.6K]2 years ago

4 0

Answer: 11

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:

Given information

x = -3

Given expression

2x² + 2x - 1

Substitute values into the expression

=2(-3)² + 2(-3) - 1

Simplify exponents

=2(9) + 2(-3) - 1

Simplify by multiplication

=18 - 6 - 1

Simplify by subtraction

=12 - 1

= $\boxed{11}$

Hope this helps!! :)

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