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Sagot :
Answer:
[tex] {x}^{2} - 19x - 42 = 0 \\ {x}^{2} + 2x - 21x - 42 = 0 \\ x(x + 2) - 21(x + 2) = 0 \\ (x + 2)(x - 21) = 0 \\ \boxed{x = - 2} \\ \boxed{x = 21}[/tex]
(x+2) and (x-21) is the factors of the x²-19x-42.
Value of x is -2 and 21.
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