Question

2 x cube - 5 x square - 19 X + 42

Answer 1

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Answer:

2x³-5x²-19x+42=0(let) if x is a zero.

Step-by-step explanation:

2x³-4x²-x²+2x-21x+42=0

2x²(x-2)-x(x-2)-21(x-2)=0

(x-2)(2x²-x-21)

(x-2)(2x²+6x-7x-21)

(x-2)(2x(x+3)+7(x+3))

(x-2)(2x+7)(x+3)

Therefore, x=2 or x=-7/2 or x=-3