Simplifying Polynomial by cancelling out Terms using Subtraction

Q. Simplify the following expression:
$(2x^2+7)+(-3x^2-5)$

1. $-x^2-2$
2. $-x^2+2$
3. $-x^2+2$
4. $x^2-2$

Q.

Simplify the given expression: $5x^4–7x^2+8x-1+3x^3–9x^2+7-3x^4+11x-2+8x^2$

Q. Emma is attempting to finish her summer reading in a week. This will allow her to relax for the rest of the summer. On Monday, she read $(3x^2+5x-7)$ pages, Tuesday $(-7x+9)$ pages, and Wednesday $(-2x^2+3x+4)$ pages. In three days, how many pages did she read?

1. $x^2-x+6$
2. $x^2+x-6$
3. $x^2+x+6$
4. None of the above

Q. Rewrite the expression in simplest terms.
$7x^3-22x^2-14x+5+(3x+4)\times x^2$

1. $10x^3-18x^2-14x+5$
2. $10x^3+18x^2-14x+5$
3. $10x^3-18x^2+14x+5$
4. $10x^3-18x^2-14x-5$