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Solve the quadratic equation x^2 + 3x + 2 = 0, by factorisation.

We need two numbers, a and b, such that a*b = 2 and a+b=3

Looking at the equation it can be seen that 2 and 1 fulfill these conditions.

Therefore x2 +3x +2=0
              = (x+2)(x+1)=0

This means we need either x+2 or x+1 to equal 0
x+2=0 so x= -2
or x+1=0 so x= -1

Therefore x= (-1 , -2)

Sophie S. GCSE Biology tutor, GCSE Chemistry tutor, GCSE Physics tuto...

1 year ago

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