A number is 42 less than its square.find the number.
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Solutions.
Almost all problems that involve the square of a number have two answers.
For this question, the answers are 7 and -6 .
x = 7
x² = 49
x² - x = 49 - 7 = 42 .
x = -6
x² = 36
x² - x = 36 + 6 = 42 .
Almost all problems that involve the square of a number have two answers.
For this question, the answers are 7 and -6 .
x = 7
x² = 49
x² - x = 49 - 7 = 42 .
x = -6
x² = 36
x² - x = 36 + 6 = 42 .
Answered by
1
Let the number you need be x.
So atq, x=x²-42
⇒x²-x-42=0.
Solving quad. eqn We get, x=7 and x=-6.
(7)²-42=49-42=7(org.no.).
(-6)²-42=36-42=-6(org.no. )
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