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Solve by factorisation 2x2 + 3x - 20 = 0
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10 votes
10 votes
Solve by factorisation
2x2 + 3x - 20 = 0

User Parkovski
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1 Answer

10 votes
10 votes
ac value is 2(-20) = -40
So what multiply to give -40 and add to give 3?

-5 and 8

So, write

2x^2 +8x-5x-20=0
then factorise

2x(x+4) and -5(x+4)

(2x-5)(x+4)
2 values of x: 2.5 and -4
User Mkuligowski
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