Find the value of 3x³+2x²-4 at x=2
2 answers:
Answer: 20
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:
<u>Given information</u>
x = 2
<u>Given expression</u>
3x³ + 2x² - 4
<u>Substitute values into the expression</u>
3 (2)³ + 2 (2)² - 4
<u>Simplify the exponenets</u>
=3 (8) + 2 (4) - 4)
<u>Simplify by multiplication</u>
=24 + 8 - 4
<u>Simplify by addition/subtraction</u>
=32 - 4
=
Hope this helps!! :)
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