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dalvyx [7]
3 years ago
14

What is the value of 4x2 + 5x - 8, if x = 3?

Mathematics
1 answer:
Ksju [112]3 years ago
5 0

Answer: 43

Step-by-step explanation:

<u>Concept:</u>

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.

<u>Solve:</u>

**Disclaimer** I assume that the expression is [4x² + 5x - 8]. If it was, then you may refer to my answer. If it was not, then you may point it out and I will redo it.

Given

4x² + 5x - 8

x = 3

Substitute the value of x

4(3)² + 5(3) - 8

Simplify exponents

4(9) + 5(3) - 8

Simplify multiplication

36 + 15 - 8

Final subtraction and addition

43

Hope this helps!! :)

Please let me know if you have any questions

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Which linear equation can be used to represent a line perpendicular to Line W passing through point (-3,-2)?
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Answer:

D) y =   -2

The equation of the perpendicular line to the given line is  y = -2

Step-by-step explanation:

<u><em>Explanation:-</em></u>

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                              1 x + o y - 8 =0

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                        b x - a y + k =0

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                        0 ( -3) -1(-2) + k =0

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                                     k = -2

∴<em>The equation of the perpendicular line to the given line  is </em>

<em>      put k = -2 in equation (i)    </em>

                        o x - 1 y + k =0

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                         y = -2

<u><em>Final answer:-</em></u>

∴The equation of the perpendicular line to the given line is  y =-2

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