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| 1. |
Solve √(2x+9) +x=13 |
| Answer» (2x+9)=(13-x)^2 - --->(2x+9)=169+ x^2-26x - - - - >0=160+x^2-28x - - - >0=x^2-28x+160 - - - >0=x^2-20x-8x+160 - - \'>0=x(x-20) - 8(x-20) - -\' >(x-8)(x-20) - - - >x=8,20. | |