what should be added to 7x²+8x+10 to get 15x-x²-4?
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Let y should be added,
7x²+8x+10+y =15x-x²-4
y=(15x-x²-4)-(7x²+8x+10)
y=15x-x²-4-7x²-8x-10
y=15x-8x-x²-7x²-10-4
y=7x-8x²-14.
.
Then,
7x-8x²-14 should be added
7x²+8x+10+y =15x-x²-4
y=(15x-x²-4)-(7x²+8x+10)
y=15x-x²-4-7x²-8x-10
y=15x-8x-x²-7x²-10-4
y=7x-8x²-14.
.
Then,
7x-8x²-14 should be added
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