Find the equation of the quadratic function that doesn’t cross the x-axis and passes through the point (1, 7)
A) y=x² +5
B) y = 2x² +5
C) y=x²-5
D) y = 2x² -5
A) y=x² +5
B) y = 2x² +5
C) y=x²-5
D) y = 2x² -5
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Answer:
LETTER B (y = 2x²+5)
Step-by-step explanation:
Substitute (1,7) to the equations
A) y = x²+5
7 = (1)²+5
7 = 1+5
7 ≠ 5
B) y = 2x²+5
7 = 2(1)²+5
7 = 2(1)+5
7 = 2+5
7 = 7
C) y = x²-5
7 = (1)²-5
7 = 1-5
7 ≠ -4
D) y = 2x²-5
7 = 2(1)²-5
7 = 2(1)-5
7 = 2-5
7 ≠ -3
The only correct equation is Option B