set up an equation and solve each problem.
1. the square of a number equals nine times that number. Find the number.
2. Suppose that four times the square of a number equals 20 times that number. What is the number?
3. Twice the square of the sum of a number and 3 is 98. Find the number.
Answers
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Step-by-step explanation:
1) (x)² = 9x
(x)²- 9x =0
x( x-9) =0
(x-9) = 1/x
-9 = 1/x-x
-9 = 1-x²/x
-9 = 1-x
-9-1 = -x
-10 = -x
x = 10
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