Find the corresponding y values for x= -4,-3, -2,-1, 0,1,2 if y = x2+2x-3. See add Details.?

Question

Show your work: (type x-square as x^2 unless using a superscript feature).

b) Use microsoft excel to plot the points found in part a and to sketch the graph.

Answer 1

Plug them in:

y = (-4)^2 + 2(-4) - 3
y = 16 - 8 - 3
y = 5

Similiar for others. The result is:

(-4, 5)
(-3, 0)
(-2, -3)
(-1, -4)
(0, -3)
(1, 0)
(2, 5)

To graph in Excel, just put the x values in one column and the y values in the next column. Select the two columns of values, hit the graph button, and choose x-y coordinate graph.

Answer 2

In fact, it is even easier than plugging the numbers in a calculator.

y = x^2 + 2x -3

y(0) means "the value of y when x = 0"
y(0) = 0^2 + 2(0) - 3 = -3
y(1) = 1^2 + 2(1) -3 = 1 + 2 - 3

You hardly need a calculator for that.

For graphing:

On the spreadheet, leave a blank line.

2nd line, 2nd column (cell B2), enter -4
2nd line, 3rd colum (C2), enter
=(B2)^2+2*B2-3

3rd line, 2nd column (B3), enter
=B2+1

Then select cell C2, choose "Copy" (Ctrl+C or use the menu); click in cell C3 and "Paste" (Ctrl+V or in the menu).

You now have two lines of data, with the first entries being -4 and -3.

Select B3 and C3, Copy; Select two columns from row 4 to row 8 (or a bit more if you want a longer graph), Paste.

You should now have two columns of data, with the first column showing the values of x (from -4 to +2) and the second column showing the values for y(x).

Select the two columns, from rows 2 to 8, then choose (in the menu): "insert graph"; the wizard will ask you for options: column 2 is your x-axis, choose a line graph (not a bar graph) etc.

Answer 3

im not going to do it, but heres what you have to do. simply the equation to y=mx+b format, substitue x for one of its values, then graph. its easy, but annoying. hope this helps :)

Answer 4

y = 5, 0, -3,-4,-3,0,5

Answer 5

So do it. All it is is putting numbers into a calculator!