Question

4. What is the result of subtracting y2 - 3y - 4 from y2 + 5y - 7?A. 8y + 11B. 8y - 3C. -8y - 11D. -8y + 3

Answer 1

B. 8y - 3

Step-by-step explanation:

First, write the subtraction as a mathematical expression:

`(y^2+5y-7)-(y^2-3y-4)`

Next, open the bracket (Use the minus outside the second bracket to multiply everything inside):

`=y^2+5y-7-y^2+3y+4`

Collect like terms and simplify:

`\begin{gathered} =y^2-y^2+5y+3y-7+4 \\ =5y+3y-7+4 \\ =8y-3 \end{gathered}`

The correct choice is B.