Home » Test Prep » PSAT Test » What is a possible value for x in x2 – 12x + 36 = 0?
What is a possible value for x in x2 – 12x + 36 = 0?
A. 2
B. -6
C. There is not enough information
D. 6
Correct Answer: D
Explanation/Reference:
Explanation:
You need to factor to find the possible values for x. You need to fill in the blanks with two numbers with a sum of -12 and a product of 36. In both sets of parenthesis, you know you will be subtracting since a negative times a negative is a positive and a negative plus a negative is a negative (x -__)(x -__). You should realize that 6 fits into both blanks. You must now set each set of parenthesis equal to 0.
x – 6 = 0; x – 6 = 0Solve both equations: x = 6
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