Which value must be added to the expression x2 + 12x to make it a perfect-square trinomial?
2 answers:
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Answer:
y = -
Step-by-step explanation:
Substitute x = - 3 into the expression
2x - 7y = 30
2(- 3) - 7y = 30
- 6 - 7y = 30 ( add 6 to both sides )
- 7y = 36 ( divide both sides by - 7 )
y = = -