Algebramedium · Past Paper
The sum of a number and its square is 42. The number is:
A6
B7
C8
D5
✓ Correct Answer: A — 6
x + x^2 = 42 => x^2 + x - 42 = 0 => (x+7)(x-6)=0. Positive value is 6.
Share this question
More from Algebra
- What is the value of x: 2(x-5) = 10?
- Factorize: x^4 + 64
- A number consists of two digits. When it is divided by the sum of its digits, the quotient is 6. If 9 is subtracted from the number, the digits are reversed. Find the number.
- Factorize x^2 + 5x + 6.
- What is the degree of the polynomial (x-1)(x-2)(x-3)(x-4)?