Question

factorize by mid-term splitting x^2-21x+90

Answer 1

x ^ 2 - 21x + 90

- 15 * - 6 = 90

- 15 - 6 = 21

x ^ 2 - 15x - 6x + 90

x ( x - 15 ) - 6 ( x - 15 )

= ( x - 6 ) ( x - 15 )

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Answer 2

Answer:

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