Question

What must be added to (5x³-2x²+3x+7) to get (7x³+7x-5)

Answer 1

Answer:

2x³ + 2x² + 4x - 12

Step-by-step explanation:

Let the number be a.

==: a + (5x³-2x²+3x+7) = (7x³+7x-5)

==: a = (7x³+7x-5) - (5x³-2x²+3x+7)

==: a = 7x³ + 7x - 5 - 5x³+ 2x² - 3x - 7

==: a = 2x³ + 2x² + 4x - 12

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Answer 2

Answer:

2x³+2x²+4x-12

Step-by-step explanation:

let the required number be x

x=(5x³-2x²+3x+7)=(7x³+7x-5)

x=(7x³+7x-5)-(5x³-2x²+3x+7)

x=7x³+7x-5-5x³+2x²-3x-7

x=2x³+2x²+4x-12