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Question

Find the roots of the following quadratic equations by the factorisation method.
2x2+53x2=0

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Solution

Given equation is 2x2+53x2=0
On multiplying by 3 on both sides, we get
6x2+5x6=06x2+(9x4x)6=0 [by splitting the middle term]
6x2+9x4x6=03x(2x+3)2(2x+3)=0(2x+3)(3x2)=0Now, 2x+3=0 x=32and 3x2=0 x=23
Hence, the roots of the equation 6x2+5x6=0 are 32 and 23

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