Question

x²-9=0 find the roots of quadratic equation by factorisation
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Answer 1

$\\ \sf\longmapsto x^2-9=0$

• Take 9 to right side

$\\ \sf\longmapsto x^2=9$

$\\ \sf\longmapsto x=\sqrt{9}$

• As it is a quadratic equation so it has two roots

$\\ \sf\longmapsto x=\pm\sqrt{9}$

$\\ \sf\longmapsto x=\pm 3$

• Roots are +3 and -3