Maths-
SAT
Easy
Question
Which of the following expressions is equivalent to x2 + 10x + 21 ?
- (x + 1)(x + 9) + 12
- (x + 1)(x + 9) + 12x
- (x + 3)(x + 7) + 5
- (x + 3)(x + 7) + 5x
The correct answer is: (x + 1)(x + 9) + 12
x2 + 10x + 21
Find the numbers that when added equal +10,
When multiplied equal 21
The numbers +1 and + 9 meet the criteria.
x2 + 10x + 21
= (x + 1)(x + 9) + 12
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|
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