Question

x^2+21x-196 factorise

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Answer 1

Answer:

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Step-by-step explanation:

${x}^{2} + 21x - 196 = 0 \\ x {}^{2} + 28 x - 7x - 196 = 0 \\ x(x + 28) - 7(x + 28) = 0 \\ (x - 7)(x + 28) = 0$