1.

Add `7x^(2) -8x + 5, 3x^(2) -8x +5 and -6x^(2) + 15x - 5`

Answer» `{:(7x^(2) - 8x + 5),(3x^(2) - 8x + 5),(ul(-6x^(2) + 15x - 5)),(ul(" "4x^(2) - x + 5)):}`
`:.` The required sum is `4x^(2) - x+ 5`


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