<span>The equation x^2 - 36 = 5x is a quadratic equation and can be solved thus:
x^2 - 36 = 5x
x^2 - 5x - 36 = 0
x^2 + 4x - 9x - 36 = 0
x(x + 4) - 9(x + 4) = 0
(x - 9)(x + 4) = 0
x - 9 = 0 or x + 4 = 0
x = 9 or x = -4
Therefore, the positive solution of x^2 - 36 = 5x? is 9.</span>
Answer:

Step-by-step explanation:
<u>Step 1: Set x to -3</u>
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Answer: 
The answer is option 4. 15% off means the price is 100-15%=85% of the original price.
Answer:
y=-5
Step-by-step explanation: