Question

x²-21x+90 question maths​

Answer 1

Step-by-step explanation:

$x {}^{2} - 21x + 90 \\ = x {}^{2} - 6x - 15x + 90 \\ = x(x - 6) - 15(x - 6) \\ = (x - 15)(x - 6)$

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