30 POINTS

Evaluate the expression for the given values...

4.) -3x² - 5x + 7

- 3 * -2 * -3 * -2

+6 * +6 - 5 * -2

36 - (+10)

36 - 10 = 26

5.) 3x² - 7y²

3 * x  X  3 * x - 7 * y X 7 * y

3 * 2 X 3 * 2 - 7 * 3 X 7 * 3

6 * 6 - 21 * 21

36 - 441 = -405

6.) 4(x - 2y)

       x + y

   4 * x - 4 * 2 X y

    x + y

  4 * 4 - 4 * 2 X -2

 16 - (+16)

 16 - 16 = 0

7. π + x√3y

  22/7 + -3√15

                3094

  22/7 + -11

                5000

      2380

= -8

      5000

Step-by-step explanation:

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answer: (-8,4) are the coordinates of a

step-by-step explanation:

let the side of square abcd is x .

thus the area of square abcd is .

now, by the diagram area of triangle ead= 1/2 × ea × ad = 1/2 × ea × x

( because ad is the side of square)

and, according to the question,

the areas of square abcd and right ead are equal.

⇒

⇒ea=2x

thus, ea: ab=2: 1

therefore, point a divides line segment eb into the ratio 2: 1.

⇒ by sectional formula coordinates of a are,

=

=

=(-8, 4)

thus the coordinates of a are (-8,4)

doubled

step-by-step explanation: