Question about Texas Instruments TI-89 Calculator

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Solve() gives me wrong answer. -20^2=12^2+2X(-5-3). The answer is -16, But my TI-89 is giving me 34 during the solve funtion. my TI-83 is also giving me -20^2=-400 not 400.

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For the first problem you have to type: solve(-20^2=12^2+(2*X*(-5-3)),x)
Also, make sure you use the (-) key on the position number 5, just to the right of the decimal point and not the - key and on the number 3 you have type regulary subtraction - key

Answered: Stevan Milanovic

Posted on Nov 06, 2011

  • 1 more comment 
  • Stevan Milanovic Nov 06, 2011

    For the first problem you have to type: solve((-20)^2=12^2+(2*X*(-5-3)),x)
    Also, make sure you use the (-) key on the position number 5, just to the right of the decimal point and not the - key and on the number 3 you have type regulary subtraction - key

  • Stevan Milanovic Nov 06, 2011

    For the first problem you have to type: solve((-20)^2=12^2+(2*X*(-5-3)),x)
    Also, make sure you use the (-) key on the position number 5, just to the right of the decimal point and not the - key and on the number 3 you have type regulary subtraction - key

  • Stevan Milanovic Nov 06, 2011

    For the first problem you have to type: solve((-20)^2=12^2+(2*X*(-5-3)),x)
    Also, make sure you use the (-) key on the position number 5, just to the right of the decimal point and not the - key and on the number 3 you have type regulary subtraction - key

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Enter the first term as (-20^2), not as -20^2. Without the parentheses the calculator interprets it as
-(20^2), which is not what you want.

Also, make sure you use the (-) key just to the right of the decimal point and not the - key.

Posted on Aug 31, 2011

  • Stevan Milanovic Nov 06, 2011

    For the first problem you have to type: solve((-20)^2=12^2+(2*X*(-5-3)),x)
    Also, make sure you use the (-) key on the position number 5, just to the right of the decimal point and not the - key and on the number 3 you have type regulary subtraction - key

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k24674.

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