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What is the value of the expression below when x=9 ? x^(2)+5x-2 Answer:

What is the value of the expression below when x=9 x=9 ?\newlinex2+5x−2 x^{2}+5 x-2 \newlineAnswer:

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Full solution

Q. What is the value of the expression below when x=9 x=9 ?\newlinex2+5x−2 x^{2}+5 x-2 \newlineAnswer:
  1. Substitute x=9x=9: Substitute x=9x=9 into the expression x2+5x−2x^{2} + 5x - 2.\newlineCalculation: 92+5⋅9−29^{2} + 5\cdot9 - 2
  2. Calculate square of 99: Calculate the square of 99.\newlineCalculation: 92=819^{2} = 81
  3. Multiply 55 by 99: Multiply 55 by 99.\newlineCalculation: 5×9=455\times9 = 45
  4. Add and subtract: Add the results from the square of 99 and the multiplication of 55 by 99, then subtract 22.\newlineCalculation: 81+45−281 + 45 - 2
  5. Perform final calculations: Perform the addition and subtraction.\newlineCalculation: 81+45=12681 + 45 = 126; 126−2=124126 - 2 = 124

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