Answer:
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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