Question

Evaluate the expression 2x2 - y + 3x" for x = 3 and y = 7.

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Answer 1

• 20

Solution:

The expression to be evaluated:

• ➝ 2x² - y + 3x

For,

• ➙ x = 3
• ➙ y = 7

First step in evaluating an expression is to substitute the given value of variable into the expression. Then you can finish evaluating the expression using arithmetic.

On putting the values of x and y in the given expression:

‎ㅤ‎ㅤ➝ 2x² - y + 3x

‎ㅤ‎ㅤ➝ 2× ( 3 )² - 7 + 3 × 3

‎ㅤ‎ㅤ➝ ( 2 × 9 ) - 7 + 9

‎ㅤ‎ㅤ➝ 18 - 7 + 9

‎ㅤ‎ㅤ➝ 11 + 9

‎ㅤ‎ㅤ➝ 20