Practice Set 2.2
1. Solve the following quadratic equations by factorisation.
(1)r -15.1 + 54 = 0
(2). + r - 20 = 0 (3)
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Step-by-step explanation:
– 15x + 54 = 0
⇒x2−9x−6x+54=0
⇒x(x−9)−6(x−9)=0
⇒(x−6)(x−9)=0
⇒(x−6)=0 or (x−9)=0
⇒x=6 or x=9
So, 6 and 9 are the roots of the given quadratic equation
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