You can see from the problem there's leftover mutiplication and addition so we perform that first
14 * (6x^4 - 7 - 5x^2) - (4 - 5x^3+ 6x^2)
Multiply in 14 on lefthand parentheses
84x^4 - 98 - 70x^2 - (4 - 5x^3+ 6x^2)
Muptiply righthand parentheses by -1
84x^4 - 98 - 70x^2 - 4 + 5x^3 -6x^2
Add and subtract common factors (numbers with no or identical ending coefficient)
now here we can factor out 2 again as an extra step
Answer: 84x^4-102-76x^2+5x^3 or 2 (42x^4-51-38x^2+5/2)
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