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Question

Subtract (5x2−5x−7) from the sum of (x2−3),(5−4x) and (9+4x2)

A
x+18
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B
x2+x+10
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C
x+24
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D
9x+18
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Solution

The correct option is A x+18
The sum of (x23),(54x) and (9+4x2)
(x23)+(54x)+(9+4x2)
=x2+4x24x+5+93
=5x24x+11
Now, subtract (5x25x7) from 5x24x+11, we get
(5x24x+11)(5x25x7)=5x24x+115x2+5x+7
=x+18


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