Which of the following quadratics has imaginary roots? (1) x² +3x – 5 = 0 (3) 2x² – 3x+1=0 (2) x² +6x+10=0 (4) x² – 7x+10=0 Which of the following quadratic, when graphed, would touch the x-axis exactly once? (1) y = x² – 2x – 3 (3) y = x² +5x-2 (2) y= 2x² +3x+7 (4) y = x² – 12x + 36

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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please help me with my homework question 3 and 4 

2. The roots of x² +4x-7=0 are
(1) unequal and rational
(3) unequal and irrational
(2) unequal and imaginary
(4) equal and rational
3. Which of the following quadratics has imaginary roots?
(1) x² +3x-5=0
(3) 2x² – 3x+1= 0
(2) x² +6x+10=0
(4) x² – 7x+10=0
4. Which of the following quadratic, when graphed, would touch the x-axis exactly once?
(1) y=x² – 2x– 3
(3) y=x² +5x-2
(2) y = 2x² +3x +7
(4) y = x² –12x+36
COMMON CORE ALGEBRA II, UNIT #9 – COMPLEX NUMBERS – LESSON #4
EMATHINSTRUCTION, RED HOOK, NY 12571, © 2015
Transcribed Image Text:2. The roots of x² +4x-7=0 are (1) unequal and rational (3) unequal and irrational (2) unequal and imaginary (4) equal and rational 3. Which of the following quadratics has imaginary roots? (1) x² +3x-5=0 (3) 2x² – 3x+1= 0 (2) x² +6x+10=0 (4) x² – 7x+10=0 4. Which of the following quadratic, when graphed, would touch the x-axis exactly once? (1) y=x² – 2x– 3 (3) y=x² +5x-2 (2) y = 2x² +3x +7 (4) y = x² –12x+36 COMMON CORE ALGEBRA II, UNIT #9 – COMPLEX NUMBERS – LESSON #4 EMATHINSTRUCTION, RED HOOK, NY 12571, © 2015
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