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Line 9: |
| 216=x2+6x<br> | | 216=x2+6x<br> |
| x2 +6x -216=0<br> | | x2 +6x -216=0<br> |
− | Substitution: x 2 +18x-12x -216=0 | + | Substitution: x 2 +18x-12x -216=0<br> |
| + | Simplification: x(x+18)-12(x+18)=0<br> |
| + | (x+18)( x-12)=0<br> |
| + | (x+18)=0 (x-12)=0<br> |
| + | x=-18, x=12<br>. |
| + | # Base=12cm, <br> Altitude=x+6 |
| + | =12+6=18cm.<br> |
| + | '''Prior Knowledge''' -<br> |
| + | *Methods of solving the Eqn<br> |
| + | *Factorisation<br> |
| + | *Using Formula<br> |
| + | *Using Graph<br> |