minnie7760
24.11.2019 •
Mathematics
Linda contructs a triangle with one side 5 inches long and another side 7 inches long.which is not a possible legth for the third side? a)3 inches b)6 c)11 d)12
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Ответ:
Ответ:
Step-by-step explanation:
Answer this by inserting a positive number between the '6x' and the '=' sign and then subtracting the same number:
x^2 + 6x + 9 - 9 = -2
Where does the "9" come from? Take half the coefficient of x (which is 6) and square the result (obtaining 36). Now add 36 after the "6x" and then subtract 36:
x^2 + 6x + 9 = 7
Rewrite this with a perfect square on the left side:
(x + 3)^2 = 7 Here we have successfully "completed the square."