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Question

Question 1(iii)
Find the roots of the following quadratic equations by factorisation:
(iii) 2x2+7x+52=0

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Solution

(iii) 2x2+7x+52
=2x2+5x+2x+52(Splitting the middle term 7x as 5x+2x because 5x×2x=10x2)
=x(2x+5)+2(2x+5)=(2x+5)(x+2)
Roots of this equation are the values for which (2x+5)(x+2)=0
2x+5=0 or x+2=0
x=52 or x=2

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