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The difference between a number and its square is 72. What is the number?
Question 1:
The difference between a number and its square is 72.
What is the number?
A.
19
B.
18
C.
30
D.
9
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x2 – x = 72. Solve for x using the quadratic formula and x = 9 and –8. Only 9 satisfies the restrictions.
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Practice Quadratic Equations Online Test 3 | Englishfreetest.com
20 minutes
10 questions
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Some questions from the same exam
Find the lesser root of the equation x2−12x+35=0.
Solve for x: x2 + 4x = 5
x2 – 3x – 18 = 0
Quantity A: x
Quantity B: 6
Solve: x2+6x+9=0
The difference between a number and its square is 72.
What is the number?
If the equation x3 – ax2 + bx – a = 0 has three real roots then the following is true
Let p and q be the roots of the quadratic equation x2– (α – 2)x– α –1 = 0.
What is the minimum possible value of p2 + q2?
I. 4x2 – 9x – 9 = 0,
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I. 5x2 + 11x – 12 = 0
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I.3x2 + 2x – 8 = 0,
II. 3y2 – 14y + 16 = 0
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