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.
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✓ 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