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3 years ago

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:

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:

**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

Hope this helps!! :)

Please let me know if you have any questions

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For example, is

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1 year ago

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3 years ago

What is 2x-5/3=7? Plz help!

ki77a [65]

Hello! And thank you for your question!

First add 5/3 to both sides:

2x = 7 + 5/3

Then simplify 7 + 5/3:

2x = 26/3

Then divide both sides by 2:

x = 26/3 over 2

After that simplify 26/3/2:

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Simplify 3 x 2:

x = 26/6

Simplify:

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Final Answer:

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I hope this helps :)