$11$ $1$ 1.The sum of the roots of the quadratic equation $ax^{2}+bx+c=01s\dfrac {-b} {a}$ $2.$ The product of the roots of the quadratic equation $ax^{2}+bx+c=0ss\leq $ To determine the quadratic equation given the sum and the product of the roots $1x\left(=$ $x^{2}-\left(thc$ sum of the roots) $s\right)x+\left(th$ (the product of the roots) $ts\right)=0$

$\bar{2} $ The product of the roots of the quadratic equation ax? $c$ $x^{2}+bx+c=0ls-$ $a$ To determine the quadratic equation given the sum and the product of the roots $2se$ $2$ (the sum of the roots) $t5\right)x+\left(t$ (the product of the roots) $s\right)=0$

$11$ 1.The sum of the roots of the quadratic equation $ax^{2}+bx+c=0$ $s\dfrac {-b} {a}$