Question

Evaluate the equation y=2x2 - 2x + 7 for x=-3

Answer 1

Problem:

Evaluate the equation:

`\tt{y = 2 {x}^(2) } - 2x + 7 \: ,when \: x \: = \: - 3`

Let's try!

`\quad \quad \quad \quad \tt{y = 2 {x}^(2) } - 2x + 7`

`\quad \quad \quad \quad \tt{y = 2 {( - 3)}^(2) } - 2( - 3)+ 7`

`\quad \quad \quad \quad \tt{y = 2(9) +6 + 7}`

`\quad \quad \quad \quad \tt{y = 18 +6 + 7}`

`\quad \quad \quad \quad \tt{y = 24 + 7}`

`\quad \quad \quad \quad \tt{y = 31}`

Hence, the answer is:

`\quad \quad \quad \quad \boxed{\tt{\color{green}y = 31}}`

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Answer 2

31

Explanation:

y=2x^2 - 2x + 7

Let x= -3

y=2(-3)^2 - 2(-3) + 7

=2 (9) +6 +7

= 18 +6+7

= 31