Question

Zandile is 4 years older than Thoko.Four years ago the product of their ages was 165.find their present ages
thoko ---x
zandile -- x+4

4 years ago:
thoko -- x-4
zandile -- x

x(x-4) = 165
x^2 - 4x - 165 = 0
(x-15)(x+11)
x = 15 or x = -11

state the conclusion

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