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How to find x? x(x+8)=33?

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  • How to find x? x(x+8)=33?


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Answer #1 | 23/07 2014 13:13
Expand the parenthesis x^2 + 8x = 33 Move the 33 to the other side x^2 + 8x - 33 = 0 Now you have a quadratic. To factorise the equation, you must find two numbers that multiply to -33 and add to 8. Those two numbers are 11 and -3 as 11 * - 3 = -33 and 11 - 3 = 8 So now you can factorise like this (x - 3) (x + 11) = 0 Final answer: x = 3 or - 11 (as x - 3 = 0 x = 3 and x +11 = 0 x = -11)
Positive: 37.5 %
Answer #2 | 23/07 2014 20:13
Expand the parenthesis x^2 + 8x = 33 Move the 33 to the other side x^2 + 8x - 33 = 0 Now you have a quadratic. To factorise the equation, you must find two numbers that multiply to -33 and add to 8. Those two numbers are 11 and -3 as 11 * - 3 = -33 and 11 - 3 = 8 So now you can factorise like this (x - 3) (x + 11) = 0 Final answer: x = 3 or - 11 (as x - 3 = 0 x = 3 and x +11 = 0 x = -11)
Positive: 20 %

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