solve the following quadratic equation by factorisation x square - 15 X + 54 is equal to zero
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x²-15x+54
x²-9x-6x+54
x(x-9)-6(x-9)
(x-9) (x-6)
x²-9x-6x+54
x(x-9)-6(x-9)
(x-9) (x-6)
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Here
a=1 , b=-15 , c=54
Therefore. D=b^2-4ac
=(-15×-15)-4(1)(54)
=225-54
=171
a=1 , b=-15 , c=54
Therefore. D=b^2-4ac
=(-15×-15)-4(1)(54)
=225-54
=171
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