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Factorisation of Polynomials — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsFactorisation of Polynomials2 Marks
Question
Factorise:
x2 - 21x + 90
✓

Answer

x2 - 21x + 90
= x2 - 6x - 15x + 90
= x(x - 6) - 15(x - 6)
= (x - 6)(x - 15)

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