MA-800

Quadratics by factorisation

Lower Sec Maths · Secondary 2 · Hard · Quadratics by factorisation

1. $(60 + 2x)(90 + 2x) = 7200$ which simplifies to $x^2 + 75x - 450 = 0$
2. $(60 + x)(90 + x) = 7200$ which simplifies to $x^2 + 150x - 900 = 0$
3. $(60 + 2x)(90 + 2x) = 7200$ which simplifies to $x^2 + 150x - 900 = 0$
4. $(60 + x)(90 + x) = 7200$ which simplifies to $x^2 + 75x - 450 = 0$

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