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If x = 3, what is the value of 2x^2 - 5?
If x = 3, what is the value of 2x^2 - 5?
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Q1
If x = 3, what is the value of 2x^2 - 5?
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Substituting x = 3 gives 2(3^2) - 5 = 18 - 5 = 13.
Questions & Step-by-step Solutions
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Q: If x = 3, what is the value of 2x^2 - 5?
Solution:
Substituting x = 3 gives 2(3^2) - 5 = 18 - 5 = 13.
Steps: 7
Show Steps
Step 1: Start with the expression 2x^2 - 5.
Step 2: Substitute the value of x, which is 3, into the expression. This gives us 2(3^2) - 5.
Step 3: Calculate 3^2, which is 9.
Step 4: Now replace 3^2 with 9 in the expression. It becomes 2(9) - 5.
Step 5: Multiply 2 by 9, which equals 18.
Step 6: Now the expression is 18 - 5.
Step 7: Subtract 5 from 18, which gives us 13.
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